Is it your age or cost thats the problem with the insurance ? If it's cost by the time you have swapped the engine you could have probably paid the extra anyway.
To do the swap you would be better to get a complete engine and gearbox, plus things like the carb, distributor. The gearbox you have probably won't have the right diff ratio anyway and having a complete unit will be a lot easier to fit and get running.
I haven't used them but there is a Mini garage of some sort at Tyford near you in Winchester who might be able to help.
I fitted a 1380 engine in my 998 Mini and it's surprising just how many different parts there are, even stuff like the radiator brackets.
I have spoken to the guys at Minis R Us in Twyford, and they couldn't give me a guide price other than a couple of grand. They reccomended that I try to call all the insurers in the Miniworld magazine and see what they will quote me for the 1300cc. So I will see what happens there. I will keep in touch with the garage at Twyford as we can assess the expense if/when I find I STILL can't get a reasonable quote from the advertised providers. We have also discussed the possibility of reducing the fee by selling them my 1300cc as part of the deal. It all depends on how much its going to cost. Ideally, obviously, I'd like to keep it as it is (less hassle and more fun) but depending on the quotations I get, that might not be feesable.
You realise that unless you change it back to an auto it's still a modification that will have to be declared. It won't cost as much with a 998 but I doubt it'll be free either.
If he changes the log book to manual then why would he have to declare the car as modded? So long as the car is standard in accordance with the VRM wouldn't this be sufficient? Agreed, better to be safe than sorry with UK insurance companies.
This is what I thought also and was told by the previous owner! The logbook declares that the car is BOTH manual AND a 1300cc, reregistered legally and properly, I even have the letter confirmation from the DVLA here. But as soon as I try to insure it, they run my plate and it brings back an auto, 998cc and then they try to hit me with modifications etc. I don't know what to do about it. It's all done legally and officially. Fyj is registered as a 1300cc Manual.