I was insured with LV prior to getting the GTI - they wouldn't cover me for theft when I changed from Leon FR - don't cover GTIs for theft unless there's a tracker fitted - I used my drive away cover with VW and changed to M&S who had no issues re the tracker or lack of it.
I was impressed and pleased that the Golf only cost £15 more over the whole year that a 4 1/2 year old Leon.