Same think happened to me..time to switch buddy!!
My renewal with TD, also is going up 30% this year. One claim NOT at fault, 18 months ago, they used the "excuse" that my model bike (which isn't a popular model, Yamaha Roadstar 1700) has had increased claims which justified the additional 30%). I have called a few places all are ball park with what TD now wants. So switching isn't always the option which is open.