suggestions for a replacement wireless central heating thermostat?

Hi
We need to replace our Drayton Digistat RF2 and SCR Receiver as the receiver has started playing up by intermittantly not sending the received signal to the valve to tell it to open. Should I replace it with another Drayton System or would anybody suggest a different make. This system was only fitted in April 2007.

Thanks in advance for any help

Diane
January 2011