I've just got home from a weekend away with Mrs P - well, mostly it was good (driving round Exmoor roads with the roof down CANNOT be bad - especially when you stay at a marvellous little place which just happens to be Michelin starred, so the food was okay

).....
....anyway, back to the point........
......we got as far as Bridgwater, when it wouldn't come out of 5th - so, with 10million revs and a slipping clutch i got it as far as a carpark - not easy

....
....now, anyone who has been there will agree, that no-one ever wants to spend longer in Bridgwater than they have to, and certainly wouldn't choose it for a weekend break, so it was down to memory as to what was needed to remedy the issue......
....not many tools in the car, (my usual selection had been removed to allow space for hairdriers, straighteners, clothes etc - plus a few bits for Angie

).....
....so a quich call to the helpful man in Swindon (Cheers, Dave!) to confirm what is required, and, more importantly, it would work well enough to allow me to continue, and not go home.
...if i'd needed to go home and swap cars, i didn't want to spend an hour wasting my time on a repair which wouldn't work.
Anyway, upshot was (as i thought) - whip off the selector box, line it all up, put it back on, and drive using 1,2,3,4 & R only!!!
Luckily, the planned trip wasn't going to involve too much 5th gear work anyway (Anyone know Porlock hill?), so it isn't a big issue - now i'm home, i just have to remember not to use 5th to get to work tomorrow, before i take it all apart and fix it properly.......
....luckily, I have a spare selector box, so i should be able to compare them and get it set up quite easily (especially with the pics and words already on here), so basically, thanks to all who have posted here (this thread and others), Specky for confirming my thoughts, and anyone else who knows me......
Note to self - put the tools back in the car - but this job CAN be done with a chisel (to undo jubilee clips, in absence of screwdriver) - also to lever the clutch arm up a bit to get the cable off.
and a 12mm 3/8 drive socket with 2 x 3" extensions to get the selector box bolts out (it wouldn't reach the last one, but by putting just the socket on the bolt, and using the chisel in the end to turn it, I managed).