On Moneybox Live (R4) this afternoon the subject of insurance was discussed, and one query was "Will it affect my insurance claim if I fit winter tyres".
Responses from the R4 panel included:
"They may be considered to reduce accident claims, and attract a premium discount".
"If you fit them without notifying the company they may be regarded as a modification to the vehicle for insurance purposes". (I suppose more so if the complete wheels are swapped).
Perhaps a good idea to notify them?
I'd never thought of switching to winter tyres, but with the stuff that's falling this week...