purchased as i thought i had faulty mother board however an actuator was blowing the fuse so this is now surplus to requirements. cost £80.
Polypipe 1 Zone Master Unit 230v PB1ZM
Polypipe Single Zone Hardwired Temperature Sensor White UFHHARDWS (D1046)
Watts Polypipe 4 Zone 24v Master Wiring Center TFH.WM.LV P05187 (PL8)
Polypipe UFH PB2ZM RF 2 Zone Master Unit PB2ZMRF
Watts Polypipe 4 Zone 24v Master Wiring Center TFH.WM.LV P05187
Polypipe PB2ZM RF 2 Zone Master Unit - White