Thanks for the response... to clarify, I was self employed 2005-mid-2007 then unemployed from Jan-Aug of 2008, then for Sept - Dec 2008, had a PAYE job, but didn't realise I had to tell the revenue I was no longer self-employed (or doing self-assessment), until I rang them and they said they could only put me back on normal PAYE from 2009 on.
But I think you've answered my question, so thanks... I have to be honest though, I don't remember receiving a P60 for 2008, I'll have to go back over my files...