This has worked wonders - he now comes up quite quickly when he sees me - to a safe distance. But in the last few days he has been getting closer and closer to the other two when they have been in their yards. So two nights ago I got him a baby bucket for some mini dinner at night with the big boys. Last night I put the bucket in the entrance of the third yard, and tonight, in the yard - just a little way. He came straight in, and I ducked under into Maraschinos yard. Here he is eating with the big boys.
Initially I thought he was not interested in humans at all but I now think he is - think (as Cilla says) that he would like to be my friend - he just does not know how.
They are all getting on really well now which is good.