How did Bobby cope yesterday while you were are work. Hope everything worked out well with your friend coming round to him. We all have everything crossed you can make this work.
Thank you, and to all the other respondents, for the warmth of your replies.
Two working days in it seems to be going well. I need to find one or more professional dog walkers that can take him on, longer term. He's become more willful and much worse at recall while he's been away which is a problem. I've booked him in for neutering which I hope may help and hope I can get him started with a dog walker, on a lead at first, asap after the operation.
All the indications are that he is happy to be home. I still think I was right to try to find him a new home where he would spend less time alone, but it does seem as if the bond between us is too strong for him to be happy elsewhere, and I certainly found it very difficult to come to terms with his absence. I don't think either of us want to go through that again.