Hi all,
Thanks to all who replied re the Kew steam cleaner with no run.
It turns out it /was/ some sort of over temp or similar cutout in the motor that had gone o/c and was stopping the main motor-run contactor from pulling in.
Luckily he also located a second hand identical cleaner today (and bought a multimeter) and was able to check said issue out on that to prove the concept before repairing the broken unit with a plain wire link (for now).
The cherry on the cake is that both units appear to be nearly identical so he now has a full set of working and tested spares, or can do twice the work while they both run ok. ;-)
He said he will get a spare main switch in any case as we have now got the proper code and I don't fancy taking one apart (no, that was easy ... putting it back together again!) again! Mind you, now we have worked out how to order and reassemble all 9 cam disks without the spring loaded contacts flying over your shoulder it's not quite so bad! ;-)
Cheers, T i m