Hi David,
Not sure if you are still looking but I found this site in the UK that make the cables:
https://www.mdbdiagnostics.co.uk
I started looking for the cost of individual components and I found MDB is competitive with their already assembled cables so it was an easy decision.
I just order both recently (OBC and cruise control) and hopefully will be able to install everything by the end of February (now, I just need to rent a durametric professional or find somebody locally to activate both!).
Hope this help you