Your personal circumstances are of no interest to them and do not matter.
All they do is take all the data you give them:
- how old you are,
- what colour your car is,
- whereabouts you drive it,
- etc, etc, etc, etc
and plug it into a mahooosive formula that calculates:
a) the likelihood you are to have a claim (doesn't matter one jot if it's your fault or not - it costs them the same whether it's you driving it into a tree or someone randomly torching it)
b) how much the claim will cost (not just the value of your car - also needs to worry about damage to property, legal claims for physical injury etc.)
That is ALL they really care about. They then calculate three things:
1) How much they need to charge you for the year to stay ahead of the curve on probability and cost (based on the above)
2) Comparison with how much their competition are charging (may involve discounts for certain targetted demographics - eg. online discounts, girl-only insurance, 10yr+ no claims, etc.)
3) Markup based on how much they think they can get away with from YOU (usually based on new customer discounts or, counter-intuitively, increases for loyal customers - the "hassle" costs)
And that's it.
Simples.