Well thats me sorted....
eBay.co.uk: heater resistor rover 200 400 45 25 up to 2000 (item 230078617767 end time 21-Jan-07 22:26:43 GMT)
As I say.."solder this here, solder that there" easy! :)
Good luck with re designing the hippo heaters!!
All I need to do now is replace that bloody thermatwat...