What is this bug?

[Oysterbabe]

I keep finding the bodies of whatever this is on the floor. Just started appearing in the last few days. We have no pets and hard floors throughout downstairs. I've never seen one alive. Various sizes but I'd say the bigger ones are just under a centimetre in size.
What is it?

Cockroach

Looks like a flea - it's the legs dangling underneath. However, that is very big for a flea!

Cockroach

I don't think it's a cockroach. It has a curved narrow body. Do we get cockroaches in the UK. It does look like a flea. It's big though and where the hell could they be coming from? We haven't had any animals in the house and I feel like I would notice if they were in the carpets upstairs. I keep finding them on the tiles in the kitchen and bathroom.

It's a woodlouse. They normally live outside, but sometimes you get them inside.