I was with direct line for years until they attempted to double my mk5 GTI cover so went to Aviva, who then also went north. So 2 years ago I went with Esure and then just yesterday I had to take out a new policy for the Mk7 GTI, based on 9 years NCD, living in London (not a posh part, but not a sh!t part), late 30s, and it was £350, before any extras, once you add motor legal, hire car, key cover, all the stuff you hopefully never need, which they kindly package up for you, it ended up at £450. I don't wish to get into argument about that £100 worth of extras being unnecessary, but the older I have got the more cautious I have become.
What I have learned is that if insurer has had a lot of claims on one particular vehicle, their system will automatically push the premiums up for everyone else, thats exactly what happened at direct line from what I understand. A few big claims and everyone suffers.
On another note, my mum has a Polo and is with VW insurance, and she had a claim and they were excellent, and the bodyshop they used was top notch, amazing job, you would never know the car had been painted and I'm fussy.
The one thing you could do, is push your voluntary excess up, but it's a risk like everything else.