See here:
https://www.uk-spares.com/index.php?option=com_virtuemart&view=category&virtuemart_category_id=18412
http://www.amazon.co.uk/Storage-Heater-Convector-Compatible-Dimplex/dp/B00NNKBY1S
http://www.ebay.co.uk/itm/Storage-Heater-Convector-Switch-With-Neon-Light-For-Dimplex-CXT12-CXT24-CXL24-/301315243590
Should be easy enough to dismantle. Take care, don't rely on memory - use a pencil and paper to make notes.
XXX
November 2015