Does your 5000hrs include an IR?
If so, like jeepys said, Premiair and Starspeed should probably be your first port of call (for the South East). Otherwise, most of the onshore IFR charter companies are always looking for competent IFR drivers. A call to your local operator(s) will probably bear fruit. Numbers in the BHAB manual.
If you haven't got an IR, good luck!
PS Coincidentally, both Premiair (Police) and Starspeed (Charter) are advertising in this week's Flight International!