sorry your sale fell through, that's always annoying.
But having to change cars and get something for just two months would have been more hassle than it's worth.
Just hold on to it a little longer, then you can get the cab you want and not lose any no claims.
I changed cars in the middle of my last insurance policy, in fact I was only about 4 months into the year, but because I changed cars and the existing company wouldn't do me a good quote, so I dumped them and switched.
Insurance is a pain, but if it wasn't compulsory in the UK (like some states in America) would you still insure your car?