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@Dammit
Called, ordered this: https://www.kuranda.co.uk/20w-solar-panel-sfp020ma-solar-technology
Chap who answered the phone said this is all I need to keep the battery topped up over winter, and that I could simply bond it to the roof.
I might just use double sided VHB tape to stick it on the roof, as (if I can find it!) I have a roll kicking about.