Hello, Charlie! You will have to wait and see if any of the root has survived ... You may not have lost them all! They are not frost hardy at all, and prefer overwintering in a frost free environment in dry compost, before being replanted out in about May time.

thank for your quick responce
i have started takeing them out my garage to somewhere warmer, and i will hope for the best
many thanks

I find begonia corms don't need to be in compost at all during the winter. I've kept them frost free in an empty seed tray over winter, then pressed them into the top of compost to start into growth in mid to late March.
Keep your fingers crossed Charlie, they may be OK

okay , thank you for that.
ont pkts of bulbs i brought said pot in jan or feb,
i had them on my garage floor since then, i got worried as the pots seemed a bit frosty so i put them in a warmer place in the house, just hope their okay
many thaks