There seems to be no rhyme or reason for some of the pricing,
Agreed. In our house there are no claims, no convictions/points (ever!), advanced IAM and PCV drivers, younger boys who each year get older and further from passing tests, two have two years of their own NCB and mrs_oab and I both have 18+ years NCB etc. Absolutely no change in driving habits, we live in a nice low crime place etc etc.
Valuable Camper: went down £10.
Cheaper Car (1lt Fabia Estate): rocketed from £560 to £1450 renewal, I managed to get it down to £960 by removing youngest child (18) from the insurance for the year…
There is, as far as I can see, no reason at all…