UK web hosts for this?

We all know that cheap and fast pageloads for hosting doesn’t exist, but what would be the lowest priced hosting for just one domain (a forum), where at the moment:
The main issue is the forums going down for a couple of minutes a few times a day with a 403 and CPU resources getting fried.

What forum is it (Discourse, Flarum, Vanilla, etc)?

How many monthly page views do you get?

How many resources are you currently using?

What forum is it (Discourse, Flarum, Vanilla, etc)? PHPBB3

How many monthly page views do you get? Not sure, how to find out?

How many resources are you currently using? Not sure, how to find out?

It seems to me qhoster.com and hostsailor.com services can be right for you.
They are cheap and reliable.