I looked at insurance about a month ago. Currently on £360 a year on the cheapest deal available in Nov on the comparison sites (the "not on comparison site" insurers like Direct Line and Aviva were poor value for me).
Current Roc price for me if I were doing a year now are about £280 (esure and Sheilas wheels) - presumably the big drop is down to the gender equality stuff coming in for Dec. The closest comparison for a MK7 GTD is insurance on a MK6 GTD (assuming same risk - 15 more PS, but a raft more safety features), coming in at about £230 with protected no claims - very pleased about that. 37 years old, about 11 years no claims, no convictions. I'm in a low risk occupation too - try getting a good price if you are a builder!
I'm with "onequotedirect" who have a £50 admin fee to change anything, whether or not they want more for (potentially) a riskier car.