shop around, try local smaller insurers. Spend up to a week phoning around and doing online quote applications. The big "0800" call centre companies companies allways charge more.
2 and a half grand is a joke! You could buy many micra turbos with that sort of dosh
what level of cover is this for? (TP / TPF&T or COMP).
Get "TP only" if youre running a cheep car, and be ready to cover any uninsured losses yourself (a new micra for around £500? if the worst happens)
Calculate how many miles you are likely to cover in a year and dont over estimate too much when telling an insurer your milage.
Ask insurers which of your statistics is causing your premium to be so high and if there is anything that you can do about it.
Also if it has not been a full year since you passed your L-test it would be well worth your while to take a PASS PLUS as this can save around 10 to 20 % on a premium (£245 to £490) in one year. and it will help with your driving too. The course is only about £100 and it is not examined like the L-test was. Its quite interesting too (if your sad like me)
If its too late for PASS PLUS, you could join your local RoADAR (RoSPA Advanced Drivers And Riders) group or IAM (Institute of Advanced Motorists) group. As some insurers offer a discount for advanced drivers or people who are training towards an advanced driving quallification.
dont rush to a policy, if a weeks worth of shopping around can save you 500 to 1,000 quid on a policy.
If the premiums are this high every where you go, I would consider running a basic, non turbo car for a year.
Good luck and hang in there!