I've used Brentacre in the past for my G40 and found them to be the best price for modified, plus they pick the phone up fairly quickly. For an unmodified G40 I have had quotes around £200 TPFT from places like Direct Line but they won't touch modified at all. My 180BHP Ibiza Cupra (fully comp valued at £15K) is cheaper to insure than my last slightly modified G40 was (third party valued at £2K).