Hi Bucket Head. Thanks for your answer.
The 5 way diverter is part of a whirlpool bath/shower unit about 5 years old imported from Spain and distributed by Tiles R us. the side and back panel is plastic and the other side panel is glass.
I'll give it a go with a hair dryer instead of a blow torch as the diverter is mounted on the back plastic panel.
I have a plummer calling to change a heat exchanger on my boiler soon!! and see what he thinks.
Over the phone he doesn't seem all that interested unless he has a detailed instruction manual on the diverter, which I haven't got.
I'll let you know what happens. Kind Regards Colin
Colin Stamp
December 2010