anyone else -building insurance rocketed this year

Are you a 'sticky' customer? Try someone else if so.

I am

shocking how they treat you

just went to  compare & found 50% cheaper

They love 'stickies', loyalty/apathy is much abused these days.

it's not like no claims cars

just phoned - reduced it by 50%

from a 20 % increase to a 30% discount

The business of many companies that have auto renew for their product is based on the inertia of their customers allowing them to increase payments.  Its now the complete opposite of rewarding loyalty.