People have become obsessed with the lowest premium.
I always check Defaqto for comparison as they only rate on features - not price. By all means look for a good price, but make sure you're getting the cover you need.
I have my buildings and contents with Nationwide - a couple of years ago when I got the renewal I did the Meerkat thing and found I could save around £15 a month. When I rang to cancel the guy asked if I was sure I was comparing like-for-like cover. Turns out it was way less cover...