shows Creda storage heater models containing asbestos with the letters SR standing for Serious Risk against some models - all asbestos containing models appear to be older than 30 years. The model numbers you offered are not shown which suggests no asbestos.
The site qualifies itself by claiming not to be expert in Storage Heater construction - and I know nothing about storage heaters.
This answer is offered as a gesture of help - no warranty is expressed or implied - there is absolutely no need to thank me...
Good luck...
Peccavi
August 2013
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix convector heaters.