if it is going to cost a small fortune to insure on a temp policy you could take out a full years policy and then cancel using the 14 day rights. Then all you should be charged is the admin fee.
I recently took out insurance for a saab 900 turbo and then had to cancel it and got charged £26 for the admin fee.
When taking out the insurance, I went through Quidco and insured it with Swiftcover. For my new policy, I was refunded £28 cashback via the quidco site.