Wanted: contacter switch for Dolphin shower?

I am looking for a working contacter switch for my 28 year old Dolphin Riviera Mk5 shower.

The plastic heater unit cracked and leaked, but I managed to repair that very effectively. I think the water in the unit when there was the leak has corroded the coil in the contacter switch, so that even after careful dismantling and cleaning it still does not work.

Maybe someone has a defunct shower in which the contacter switch still works? You can call me on 01872 864792