Centuarplus wiring

[the pict]

I have to replace a 2 channel controller, However a straight swap is not an option as someone ( the homeowners son) has disconnected all the wiring from the wall plate,
it has a room stat incorpoated any one gt a wiring diagram I can work to as I cannot work out what did what other than identify the supply through the switched spur, any info would help
Pict

 

[colshaws]

this any good http://www.tlc-direct.co.uk/Technical/DataSheets/Horstmann/HOC21-C27_installer.pdf