David Jason mentions this show in his autobiography and I must confess I'd never heard of it before. Apparently it was a kids' comedy/detective series made by Thames and shown in the summer of 1970. It starred DJ, Denise Coffey- and a large English Sheepdog. I get the impression it was created almost as a goodwill gesture towards David and Denise who it seems were left unexpectedly high and dry after Michael Palin, Terry Jones and Eric Idle decided not to continue with Do Not Adjust Your Set. I believe they wanted to move it to an adult slot to give them more freedom, but Thames disagreed, so they walked away.
An online trawl suggests Two D's featured some interesting guest actors from Gerald Flood and Angela Douglas to Norman Vaughan. Sounds fun, however David Jason claims it was a nightmarish studio production due to the dog never doing what it was supposed to. In fact he expresses the hope that the tapes were wiped. Given the state of Thames children's tv archive around this time that would seem a reasonably safe bet- Anita In Jumbleland, Ace of Wands etc- yet TV Brain says that the series exists complete. I don't think I've ever seen a single clip from it. Does anyone remember the show? An episode would have made a good bonus extra to the DNAYS dvd set.