IMHO you should certainly try Centreline Air Charter.....ahem, the largest light twin AOC operator in the UK....ahem. Call 01275 474357 there is a thoutooughly nice chap there, can't remember his name....Phil something....ahem.
Phil
did I mention you can get a quotation from their online quote system at
www.centrelineair.co.uk at all
OK, shameless marketing over
Phil