Wot Frank sez!
Seriously drive and be damned.
Just keep reminding yourself that virtually any other car would be depreciating more in a year what your insurance is costing.
Enjoy that throbbing V8 whilst we're still allowed to

Oh, and try Brunel Insurance brokers (in London) run by a fellow petrol head and recommended to me by a couple of TM'ers. Not sure they will be any better than what you have but worth a try. They cover my Morgan (& 2 other cars) for me and have been quite competitive and less hassle than most.