Fleece would have been good, but yes, move them close to the house wall and if you have a sheet of plastic, just loosely fix that over, but make sure you remove it first thing in the morning.

yes I agree, give it protection if you can.

And if you can move it to a place that doesn't get early sun. Damage can be caused to the flowers if frosting is thawed too quickly.

I’ve moved them already! They’re now very near the house and where they won’t get morning sun
Thank you so much for all the help. I took advice from Growsonyou last spring and repotted and fed them and they’ve done so well. They’re a present from my daughter and I’d have been very sad if they’d got damaged.