Ahhh see ur fooled till you get some ncb behind you. One you have 1yrs ncb and you're 21 you will be able to insure a gti pretty much hassle free.
Don't know you're budget, but for some reasons insurance companies think the new Ibiza Cupra is a insurance group 4 car so insurance is cheap on those for what you are getting. Loads of 18/19 years olds got em because of this!