Back in 1991 when I last moved house, the Nationwide arranged insurance as the mortgage was with them and it was over £500 a year. I stopped that insurance after a year or two since which it has cost between £200 and £300 and even now, 27 years later, I still only pay just over £300. So definitely a rip off.
Also a more recent phenomenon is penalising loyalty as they put up the renawal price relentlessly each year while all the discounts are for new customers. You have to vote with your feet.