Is a Maths with computer science degree at Reading university worth it?

Been stuck between maths with cs degree at either Exeter, Strathclyde, or reading as I have offers for all. Exeter and reading are the main ones on my mind because I live in London and Strathclyde is a bit of a long journey.
I understand that Exeter is a better uni but I'm not confident in my ability to achieve the required grades (ABB with A in maths).

I could firm Exeter and make Reading my insurance but that leads to my next worry as acquiring accommodation at Reading may be a problem.