Used to live by the canal in Parbold,it was surprising how many hard core cruisers went right through the Winter. Think quite a few get lifted for dry storage but I'd imagine since COVID there are more live abroads that just moor up for the coldest months.
Looked it up.
The vast majority moor up at designated purpose built over winter moorings, which are normally bolted onto marinas - which have full facilities, electricity, sewage disposal facilities etc