Just out of sheer curiosity I have been getting some quotes for other cars.
Turns out that to insure a 2008 Audi A3 2L is cheaper than my current insurance for my mk2 golf. Just not fair...

It's £679 for the Audi and £790 for my golf. That's with my 3 points, a claim and my OH and parents on also. Oh and I'm 20 (almost 21).
3.2 V6 Audi TT it's only £1437.
2L (2009) GT Sirocco - £1065.
and for a 1L Aygo it's only £342!
It's also cheaper for me to insure a 2006 Ford Mustang (at £3635) than it is to insure a M3.

Tempted now to use the MK2 as a show car and buying something else if I could find 20k.