Here's the update. Clicking on the link at the top of this thread will take you direct to his MT page and you can view the video from there. It sounds like he is making fantastic progress.
Dobby gets on well with the other dogs here and sleeps through the night in the kitchen with them; he ignores the cats. He toilets outside. Dobby is used to short car rides. He loves his walks in the wood and is off-lead there now, never going far away from me. He'll turn to 'his person' for security if new sights/sounds worry him; he is no longer startled by passing cyclists and horses. Dobby needs a forever home with a confident, gentle dog. He also needs someone around for most of the day. At this stage in his development as a pet dog, a busy household with young children wouldn't suit him.
The plastic cone is off and his coat is growing back. Dobby has changed: The loving, playful cocker he was always meant to be is emerging, fast!