Shop around.
Most insurance companies zap up all re-renewals and hope the punter just pays.
In many cases, they use "bots" to send out the re-renewal papers and the "bots" just add on 10% +++ on previous premiums.
It is very worthwhile getting alternative quotes. I am actually doing so myself at present. Furthermore, the new Mk VII Golf is 5 insurance levels below the Mk VI so there is no excuse by the ins companies to hike premiums up.