Only the most recent renewal cycle is covered by the change in the law though. Before then all new customers got cheaper premiums.
But, to be clear, what I was suggesting is to do a new quote as a new customer for your exact cover with your current provider, and compare that to the renewal...
They can no longer charge existing customers more than new ones.
https://www.moneysavingexpert.com/news/2021/05/-insurers-banned-charging-existing-customers-more--new--loyalty-/
My advice would be if you have not had a claim to compare your renewal premium with a brand new quote and with other...