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fix: ValeofWhiteHorseCouncil: don't infer a collection date into a bank holiday week - #2229

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@dpage

@dpage dpage commented Sep 11, 2026 •

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Follows up on #2213, where @sammort pointed out that the fortnightly roll-forward gave 31 August, a bank holiday. Vale of White Horse moves collections on every bank holiday (changes to collection days), so any inferred date in such a week will be wrong, and only the council page knows the rescheduled day.

The roll-forward is now conditional: a past date is advanced by 14 days as before, but the bin is left out until the page catches up, rather than publishing a guess, when the date lands somewhere the council collects late:

  • a week containing an English bank holiday (checked with the existing is_holiday()); the council's 2026/27 leaflet shows each single holiday shifting only its own week, and Easter's two weeks each contain their own holiday, so only the week the date lands in is checked and rolling through a holiday week to a later date is fine;
  • 24 December to 17 January, because Christmas slippage outlasts the holidays: the same leaflet revises every collection to 15 January (two days late until 9 January, one day late the week after) and 2025/26 returned to normal on 12 January, with no bank holiday in those January weeks.

Dates the page states outright, including rescheduled ones, are returned as they are.

Also fixes an older problem in the same place: the page carries no year, and in early January it still shows the December date of the current fortnight, which parsed with the current year was a collection eleven months ahead, returned as genuine. A page date more than six months away is now read as last year's.

Unit tests cover the plain roll-forward, the 31 August case from the issue, rolling through a holiday week to a normal one, Christmas week, the January slippage weeks, a December date seen in January, and a rescheduled date read from the page.

…nk holiday week

The fortnightly roll-forward from robbrad#2213 gives a date the council will not
collect on whenever the inferred date falls in a week with a bank holiday,
because Vale of White Horse moves collections on every one of them. The
scraper now infers only when the Monday to Friday of that week is holiday
free, using the existing is_holiday() helper, and otherwise leaves the bin
out until the page shows the real, rescheduled date.

Adds unit tests for the roll-forward, the bank holiday and Christmas cases,
the year boundary and a rescheduled date read from the page.
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  • uk_bin_collection/tests/test_vale_of_white_horse_council.py
  • uk_bin_collection/uk_bin_collection/councils/ValeofWhiteHorseCouncil.py
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  • uk_bin_collection/uk_bin_collection/councils/ValeofWhiteHorseCouncil.py

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📝 Walkthrough

Walkthrough

The Vale of White Horse scraper now checks bank-holiday weeks during fortnightly date roll-forward. Tests cover normal roll-forward, holiday suppression, rescheduled dates, Christmas, year boundaries, and continuation after a holiday week.

Changes

Vale of White Horse roll-forward

Layer / File(s) Summary
Bank-holiday roll-forward handling
uk_bin_collection/uk_bin_collection/councils/ValeofWhiteHorseCouncil.py
The scraper checks working-day bank holidays in the target week and skips rolled-forward dates when a holiday is present.
Roll-forward test coverage
uk_bin_collection/tests/test_vale_of_white_horse_council.py
Tests freeze council responses and time, then verify normal roll-forward, holiday suppression, rescheduled dates, Christmas, year-boundary handling, and continuation after a holiday week.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 92987

The scraper preserves normal fortnightly scheduling while avoiding inferred dates during bank-holiday weeks, with coverage for holiday, rescheduled, and boundary-date cases.

🚥 Pre-merge checks | ✅ 5
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Check name Status Explanation
Docstring Coverage ✅ Passed Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 2 files.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly identifies the Vale of White Horse council fix and the main behavior change: preventing inferred collection dates in bank-holiday weeks.
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Actionable comments posted: 1

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Inline comments:
In `@uk_bin_collection/uk_bin_collection/councils/ValeofWhiteHorseCouncil.py`:
- Around line 115-125: Update the stale-date advancement loop in the council
collection logic to call week_has_bank_holiday(bin_date) after each 14-day
increment and immediately continue when it returns true. Do not continue
advancing or emit a later inferred date once any intermediate date is in a
bank-holiday week.

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  • uk_bin_collection/tests/test_vale_of_white_horse_council.py
  • uk_bin_collection/uk_bin_collection/councils/ValeofWhiteHorseCouncil.py

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Rolling through a holiday week to a later date is deliberate: the holiday
shifts the collections of its own week and the fortnight then resumes on the
usual day, so only the week the inferred date lands in is checked.
…ecember dates seen in January as last year's

Christmas slippage outlasts the bank holidays. The council's 2026/27 leaflet
revises every collection from 25 December to 15 January, two days late until
9 January and one day late the week after, and 2025/26 returned to normal on
12 January; no bank holiday falls in those January weeks, so the week check
alone still inferred wrong dates there. Inference is now also withheld from
24 December to 17 January. Easter needs nothing extra: Good Friday's week and
Easter Monday's week each slip by a day and each holds its own holiday.

Separately, the page carries no year, and in early January it still shows the
December date of the current fortnight; parsed with the current year that was
a collection eleven months ahead, returned as genuine. A page date more than
six months away now belongs to last year, which puts it in the past where the
roll-forward, and the Christmas rule, then apply.
@sammort

sammort commented Sep 11, 2026 •

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Thanks for your thorough work addressing my concern @dpage

I wanted to add that South Oxfordshire Council uses the same "BINZONE" web app as VoWH and so this and your previous change could be applied here too.

robbrad pushed a commit that referenced this pull request Sep 24, 2026
…oliday or Christmas week

The page publishes the current fortnight's pair of collections rather
than the next occurrence of each bin, so a past date is rolled forward
by 14 days. That's wrong when the roll-forward lands in a week the
council collects on a different day - which only the page knows. Skip
publishing a guess for a bank-holiday week (checked with the existing
is_holiday()) or the 24 Dec-17 Jan slippage period, where the council's
leaflet shows collections running one to two days late well past the
last holiday.

Also fixes a separate bug: the page carries no year, so in early
January it still shows the current fortnight's December date, which
parsed as this year's December was returned as eleven months away. A
page date more than six months ahead is now read as last year's.

Credit: dpage (#2229). Follows up on #2213.

robbrad commented Sep 24, 2026

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Thanks for the thorough writeup and test coverage — the holiday/Christmas-slippage reasoning and the December-seen-in-January fix are both good catches. Folded into the next release PR in #2241 with credit. Closing this one out.


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@robbrad robbrad closed this Sep 24, 2026
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3 participants