romanby1 is right. I always use the comparison sites to get a new quote. This year I have a new policy with the same company as last year but £50 (about 25%) less than the renewal quote.
See MSE for advice. I don't usually go past part 2 of step 2 (though I may try Direct Line and/or Arriva if I can be bothered) but do read on - particularly the comments in step 4.