My 1.6 Match diesel Mk6 cost me £275 to insure. The quotes for the Mk7 GTI were around the same money, if not slightly lower. I'm surprised to say the least.
It depends on a lot of factors though. When you start out driving, the type of car has a massive impact on the premium - not only are you young and inexperienced, but also far more likely to cause damage to self or others in a sporty car. As you get older, your chances of causing an accident are generally not too heavily influenced by the type of car you drive. A 1.6 Ford Focus is just as lethal as a 2.0 Golf GTI. Not only that, newer cars are safer anyway, and I would also argue that driving something like a Golf GTI is safer still than something like a 1.6 Focus. You have more power to get out of situations, better brakes, and generally better handling.
Just got a sample quote from Confused.com for the GTD, £226 fully comp. Around £60 quid cheaper than this year's premium on my 7 year old Focus ST. That, plus £20 year road tax (£250 saving on the ST's Tax) and over double the mpg so well happy 
That's great

Just not convinced the numbers still stack up as much when you factor in the fact that the new car loses more than that annual saving in tax and insurance every single month!