Hi Micheal,
Well I managed to get a php job on the basis of teaching myself some php for my dissertation. I had no professional programming experience!!
You'll find it difficult to get a 'pure php' job. Mine is combined with the usual suspects (perl, javascript, etc) plus some sysadmin of Linux boxes.
Do a search on jobsite.o.uk, jobserve.co.uk and planetrecruit.com
They are all you need. Most of the php jobs are in London or up North.
My advice would be to look for a company that is very well established (5+ years) or one that hasn't expanded at some astonishing rate in since it started. I had an interview last year with a company that went from 1 to 40 employees in 9 months!!
And the other thing is to remember you don't need to know all they expect you to as this forum is never very far away!! :-)
Let me know how you get on.
-- Nick Gushlow.