Td4 Cruise Retrofit!

Hi - I've the same M47 engine in Rover 75 CDT - and have assembled all the cruise retro-fit oem parts after discovering the loom was present. I understand that Testbook enabling is now the way to getting it actually working, but wondering how advanced all you lot are in the same 'project'!
Anyone managed it, had problems, whatever...? I did actually see a 4x4 specialist to try to see whether 'your' testbook would work on my car, but they are only 80% compatible as cant access the BCU area where all the switchinf of cruise and traction control is actioned)
(Seems theres a fair bit of crossover on the cars... lots of the CDT owners have Roverron Synergy units and MAF compensators, are altering restrictive air inlet and contemplating decats in search of power and more mpg)

Bit difficult this one this Pondweed, well done fer attempting it , and yes you will need to enable it via a test book format suggest your best to get in touch with Bell autos or Rover Ron, they might not do it but are very helpfull and could give advice as to what codes you'll need , unfortunately all the advertising on this site is down at the moment, so unable to access addresses, puters can be er dog sometimes. . . . .un best oh luck. . .