GE is right, most ebay repair services just replace the microswitch but I've been in touch with Chris and he says he can sort my keys out. If you look at his ebay listing it looks like a more comprehensive service than the others so I'm confident he can help.
I'll send him my key in the next week or so
Thanks again for everyone's advice and help
Well if it gets sorted then its much cheaper than a new key. You can do some reading between the lines though ie:-
1. Anyone can attach an uncorroborated quote in their ad. (self praise is no recommendation)
"It's nice to see that there are still people out there, who still care about giving great customer service for such a reasonable price."
2. The page states that the service is for flip keys, tho there is a pic of a code1 remote.
3. The get out clause is there, so you wont see any new board fitted as a replacement, maybe a s/h one if its available, but more likely you will get it back un-repaired if the processor is duff.
So my observation is that if its something loose, it will besoldered up and the switch replaced. (REFURBED!)
Someone did produce the black plastic switch push cover at one time for the after market, I think. Also the switches are available from switch manufactureer. The rest of the discrete components are easily locatable.
That leaves the PIC that is locked so not readable. Eastern european guys can get a read-out, they need 2 working ones and £100 when I checked last.
Getting a spare from breakers is probably the easiest bet.