Add Scottish Water support to downstream impact pipeline and data docs

[Copilot]

This PR adds Scottish Water to the downstream impact workflow using the new poopy.companies.ScottishWater integration and updates public documentation to include Scottish outputs and source attribution. It keeps Thames historical handling unchanged (Scottish data is current-only).

• Downstream processing: wire in Scottish Water

  • Added ScottishWater import to update_downstream.py
  • Added scottish to the company processing list
  • Added class instantiation mapping for scottish -> ScottishWater()
  • This enables publishing to the expected downstream_impact/scottish/ path with existing filename conventions

• README: expand published datasets

  • Added a Scottish Water row to the Water Company Data Table with current/48hr/info/timestamp links under downstream_impact/scottish/
  • Updated scope language to include Scotland in the project summary

• README: source attribution

  • Added the Scottish Water overflow API link in the Source Data section:
    • https://www.scottishwater.co.uk/Help-and-Resources/Open-Data/Overflow-Map-Data

Example integration change:

from poopy.companies import ScottishWater

watercompanies = [
    # ...
    "scottish",
]

# ...
elif company == "scottish":
    watercompany_info[company]["WaterCompany"] = ScottishWater()

[AlexLipp]

@copilot Just noticed that Thames Water is not referenced as a data source in the readme (https://data.thameswater.co.uk/s/). They maintain their own API like Scottish Water. Can you fix this please?

[Copilot]

@copilot Just noticed that Thames Water is not referenced as a data source in the readme (https://data.thameswater.co.uk/s/). They maintain their own API like Scottish Water. Can you fix this please?

Done in commit 97a2fcf: added an explicit Thames Water API source reference in the README Source data section (https://data.thameswater.co.uk/s/).

[Copilot]

Pull request overview

Adds Scottish Water to the downstream impact publishing workflow and updates README dataset links/source attribution to include Scottish outputs.

Changes:

• Wired scottish into update_downstream.py (company list + ScottishWater() instantiation).
• Expanded README scope statement to include Scotland and added Scottish Water output links.
• Updated README source attribution to include the Scottish Water overflow open data link.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
update_downstream.py	Adds Scottish Water to downstream processing and output publishing under downstream_impact/scottish/.
README.md	Documents Scottish Water outputs/links and updates scope + source attribution.

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[Copilot]

update_downstream.py imports ScottishWater from the external poopy package, but this repo doesn't appear to pin/document a minimum POOPy version. This can cause the cron job to fail at import time on environments still running an older POOPy. Consider adding explicit dependency/version pinning (requirements/pyproject) or at least documenting the required POOPy version and failing with a clearer message if the import isn't available.

[Copilot]

This sentence updates the scope to "England and Scotland", but the README title/subtitle at the top still says the project maps discharges across England (and has a commented Wales note). Consider updating the earlier line(s) too so the README scope is consistent throughout.

[AlexLipp]

@copilot apply changes based on the comments in this thread

[AlexLipp]

Approve