Hello Stephen,
I was in a similar situation with our non-Audi less than a couple of months ago, where not only had the premium hiked, but without bringing it to my attention, their had also increased the compulsory excess - so beware and check! As with yourself, my circumstances hadn’t changed. They (a certain two-letter company) did reduce it a bit via. phone query, but it was still not competitive enough. I eventually took out a policy with Darwin - a subsidiary of Churchill at a more competitive rate, but quite a bit more than I had paid last year. I too had found that comparison site rates had certainly gone up since last year.
Having said all that the premium on the Audi had only increased slightly, and indeed very little in the end - following a phone call.
Of course, you have Adrian Flux on here who appear to have discounts for forum members. In my experience, ‘Discounts’ are only meaningful where the ‘original’ price is itself competitive, but could be worth a try.
Kind regards,
Gareth.