Thanks for all the help, but still none the wiser
I have tried everything that has been suggested and the motor still gets hot and sounds sick.
I also got round to trying a different motor this evening and although it sounds normal it didn't seem to have a great deal of power, which I assume could mean that something is up with the speed controller
I would assume that by trying the motor I ran that got wet with a speed controller I know that works will not cause any problems? As that will help to narrow it down as to whether both or just the ESC is not quite running properly!!
Thanks for the offer Kev but I won't be at Worksop at the weekend.