I used this website last year and followed the suggested processes. I did it with car insurance for me and the missus, house insurance and 2 landlords policies. Ended up saving myself £1400 in 1 year on insurances alone.
I highly recommend using this website, he maybe very annoying but Martin Lewis knows his s^*t!
Incidentally, I'm with flux too. Me and the missus (32 and 36) all mods declared and insured like for like £580