Hi there, and
to Purrs
Sorry to hear your furbabes are nervous, I can't really offer much in the way of advice to be honest, but I'm sure some other peeps on here will have lots of great ideas for you.
The only suggestion I have is a Feliway plug-in which might help to calm them a little, you can get them from your vets, or through Vet UK. I know there is a link where you click and some of the rescues on here benefit from your purchases too, I can't find the link at the mo as I'm at work, but I'm sure it will appear on here in a while
What are your furries names, and can we see some piccies please .... need piccies on here we do