New thermo switch ordered so out with the soldering iron next week. For the meantime assuming the only risk to running the orange wire to an earth is on the compressor, ie overheating/burning out?

Wammers, noticed you aren't far from me (updated my location).

Anyways much thanks to all for advice, welcome and friendliness on my first thread.

Yes, you can run it like that for some time. I did for almost a year, but be mindful of the compressor running for a long time (more than 10min), as the motor can melt, if your airlines and bladders aren't up to scratch.

Cheers, Crt