Clearly this depends significantly on role, but looking at your link indicates that £43k is a bit below-par (as I'd expect) for any of the more in-demand areas.
For example, if you can interview well (regardless of skill) then you can probably get a mid-level DevOps job for ~£60k if you shop around a little (or just put 'DevOps' on your linkedin profile and wait - I have multiple messages from recruiters suggesting £55k+ despite DevOps not really being what I do any more, and I suspect these aren't the top payers).