hi! I have six points so am well versed with using every trick possible to get cheaper insurance.
1: Play around with the value of your car. My saab 900 was like £200 cheaper p/y when I declared its value as 3k as opposed to a grand.
2: Job, student is usually cheapest, it's worth playing around with the wording of your role. Personally, lgv driver was cheaper than van driver, I've also declared the van as a company car for work use, technically correct.
3: Check your named drivers. It isn't always cheaper to have them, my policy decreased by £50 when I removed my parents, the opposite could be true however, as it is for most people when they first pass. Don't forget that named drivers can be anybody, with permission.
4: mods. Some can be beneficial. On my saab 9-3 Ive declared wider tyres as a mod, and parking sensors. The tyres are 35 as opposed to 25, and the parking sensors are from factory, saved £20 I think.
5: Milage. the general rule is to declare the lowest you possibly can, but sometimes 5k is cheaper than 1k. Also bare in mind that if you are to have an accident and you're less than 10/20% over the milage you've declared, you could probably get away with saying that the extra miles were accrued by another person driving with third party insurance. This is of course fraud, however.
6: Location: Could you get away with claiming the car is stored at a different place? While at uni I declared the parking location as my parents drive, when in reality it was a street 400 miles away. Technically legal as my parent's home was my permanent address, but a bit iffy.
7: Timing, If you don't need to insure a car right now, it's pretty much always cheaper to have the policy start in a week or two.
7: Turn 21. It's unreal. the insurance on my 9-3 dropped from 1.5k to £500 overnight.
With regards to sites, compare the market has been the cheapest for me recently given I am young, have points, and own a fairly powerful car, however before now confused.com gave the cheapest quotes.
Regarding cars, look for vehicles that old people drive. Volvos, Saabs, Skodas, select Audis and Toyotas (avensis). No hatchbacks. Essentially you're looking for cars that aren't driven by people your age: They won't have been binned into a hedge by people your age, and insurers have less data on them regarding your circumstances