Thanks for the advice guys, i'll think i'll put the summers on and then wait till there is stock in the winter to replace the tyre.
I did try mytyres but the lead time said (It may take a while for these) and didn't give any estimate.
It is a run flat but I think I've already been running on it for a week with the nail and given it a bit of a hard time as I didn't know about the nail. Not only that I would much rather spend £150 on a new tyre than £30 on a repair and be certain of the integrity of the tyre in my case the car is a £25K some of yours are worth a lot more and the rubber on a car is one of the most important parts where grip and braking are concerned so I'd much rather do a proper job.
Thanks for all the opinions though, everyone has there own ideas and choices