Hi phil,
Habe you ever tried Direct line? When i first got my motor I paid over £1000 plus £300 excess for an import 3 Ltr ES300
Year later called Direct Line and got it for £500 with £300 excess.. i am 30 with full no claims and 3 points.
Let me know if you have tried them.. if not give them a call and see what they can do it for and let us know
:)