Insurance in general is rising rapidly and will do so for the next few years, it is more a factor of what is going on in the industry than your vehicle. Firstly, change your insurer. If you do not change your insurer then the premium will always increase based on their current system of working.

There is an issue because of where you live. Ford Focus are very common in that area and they are more prone to being instigators of "crash for cash" staged accidents. You can also get five people in a Focus but only two in an MX5, five whiplash claims - at £3000 each - cost more than two. Birmingham is one of the "crash for cash" hotspots in the UK, though this has dropped off a little this year.