So our pet insurance quote for this year is a grand total of £1690, or #141 per month

The Big Dog has a very managed pre-existing condition (dietary allergies, we just buy Hills ZD online, problem solved) and has had one operation on a tendon a few years ago which ran into thousands. But we've not claimed for anything for a couple of years, had nothing more than a cut or ear drops from the vet. I am fecking flabbergasted by that quote, and then to top it all see that it is basically 85% cover because he's over 8 so there is a "15% ‘co-payment’ contribution thieving robbing charge. So it's basically 2k for 85% coverage.
Has anyone just put the money in the bank instead? Would any vets advise it? What would £1700 buy you in terms of vets bills I wonder?