Please talk me down mice related

[Purplesilkpyjamas]

Three mice seen in a bedroom last night. No signs of how they could access the bedroom other than under the door. No services available over the weekend. Any advice?

Industrial estate? That's just weird.

I use humane traps and release back into countryside, none of the options are nice but I see that as the least worse.

Check behind the furniture because in my old house mice had actually chewed through the wall behind furniture

You need to get rid of the mice before you block up the holes. You really don't want them breeding in your home.