Hi there BritishGuy
There are a number of N registered private jets flying around europe, and the the possibillity is always there for a job. You can also consider flying on VP registered of which there are a few in europe. How many there are operating out of the UK I have no idea, but if you are willing to consider the rest of Europe, the chances are there. On a long term basis I would recomend You face up to the inevitable JAR, that will ease things conciderably for you and give you more options IMHO.
Get into the Lear ASAP, it`s a great plane, and experience is everything. ( Which lear btw)
Good luck.
O