Do what I do and just set a dummy quote up on Admiral (usually cheapest anyways) and have a play around.
Use your home address
name - Test Test
Email - Test@test.com
Telephone 0845 000 000
then put in all your figures and just keep amending the quote......its quite surprising actually.........lumping excesses up to like £750 does next to feck all for example.
Its all based on bloody risk models, post codes, statistical anaylisis as opposed to anything that makes sense.........I/E if you get broken into once your more likely to get broken into again (statistically).........pile of robbing, puffed up blowfish turd if you ask me.