One of the joys of sharing your home with a cat.

My son's house backs onto a small park and his 2 cats are in their element in the spring, catching baby mice and bringing them in through the cat flap.

My son has been known to get up at 3 am when he can hear scratching behind the wardrobe, he catches the mouse and puts it in a box with air holes, and drops it off a mile from home on his way to work the next day.

A cardboard poster tube, or the inside tube of bacofoil or similar.
Givesthe mouse safe respite from the cat overnight - and then you can free him (tip into a high bucket in the morning).
I used to keep a permanent poster tube under the bed just to save on disturbed sleep.

Good luck.

I don’t have peanut butter but I have found that they like peas so I will get some from the freezer.
I am not doing this alone but my GD and her BF are on a half day today so we shall tackle it together
I do want to get it before Molly does, she will be locked in another room.

Poor thing will be hungry now. I’d put a dollop of crunchy peanut butter on the floor and sit patiently on the bed with a lightweight towel. As it’s eating, throw the cloth over it and scoop it up.

Has worked a few times over the years.