Just phoned up and got the renewal down from £801 to £631. They don't price match Admiral group, but it turns out that I still had my parents as named drivers (70 and 74), added a few years ago purely as a renewal reducing exercise. Now it seems to be having the opposite effect, so removing them and also reducing my annual mileage slightly from 10K to 8K miles dropped the renewal price.Girlfriend was insured with them, and we had a nightmare with the quality of work conducted by their "approved repairer" when someone crashed into her parked car a few winters back. Basically came back with obvious structural damage untouched. I'd rather try and avoid them in the future.
EDIT: Just re-checked my comparison quotes and realised they were all including a £250 voluntary excess. Current provider's renewal (Christ Knott) is based on a £0 voluntary / £200 compulsory excess. Adjusted the comparison to remove the voluntary excess, which closes the gap...but still includes £350 compulsory excess at a minimum, making it harder for me to get CK to price match. I might ring them up and see if adding a voluntary excess will lower the premium.
Happy with that. Still miss the days of paying ~£300 a year, but it's slightly less than last year's premium at least.