Hi Siobhyb,
Thanks for your reply.
You are right. I thought it was a theme issue but it wasn’t in the end. When I went into WordPress today it told me that my Twitter widget had been deactivated. So I installed a new Twitter widget that complies with all the recent Twitter updates.
Still my Facebook widget was half the size, so I just deactivated and re-activated it and all is well!
Phew!! ??