The bike's booked in for the 17th, the earliest slot available at my local garage who will do the repair, no question. To be honest I'm not 100% sure it is a nail in the tyre. The tread pattern has small round holes as well as groves and in one of the's small holes is where the nail (?) is. It could be a small stone and the spit test shows me it is not leaking at all.
I don't want to remove it then maybe end up with a flat tyre until I'm at the garage where it will be repaired so I'm going to leave it in. I have been honest with the mechanic and he said it is okay if on the day he isn't needed, he understands and would do the same in my position.
So, until then I am going to continue using my bike with the emergency kit under the seat but limit the speed until it's sorted. I could drive everywhere but I hate driving unless I need to go a long way on motorways. I'll let you know how I get on.
Thanks for the advise and comments and for anybody who thinks I may be a little crazy, I am.