Well the cheapest quote I got for the standard car was £506 off comparethemarket.com so £173 more for declaring the remap. I rang Greenlight and sky insurance companies (I had read about both of them on here some where) when they asked any modifications just tell them. With the policy I have taken there is no extra costs for any other mods until I get a stage 2 map on, so exhaust, induction kit, coilovers and anything else that does affected the power a lot. And with Sky and Greenlight you get an extra discount for being a forum member. It's worth giving them a call next time your insurance needs renewing, I was surprised how cheap there quote.