I think they will be fine now,Pdp.Our forecast for the week ahead in Yorkshire,gave no frost,and temps at night in double figures,and you aren't that far away from us..I've just finished planting everything out this weekend..I usually wait till the end of May..

The great thing about hanging baskets is you can still take them in at night if low temperatures are forecasted......at least in the early days. I would say plant them up but still keep one eye on the weather.

Good point,Johnp..and pots can be covered with fleece ,if we do get some frost..