You are a kind and generous person Liz the Squeak, and thank you so much for your valuable advice and information. I have just booked at a Hostel in West London that is near the Underground and have also booked a Travel Pass for each of us.
By , not so strange I suppose, co-incidence my internet investigations turned up the name of a YHA place in Holland Park also where I had boarded for some 3mths or more back in 1959. I had lived in London for approx 6yrs from that but have only made one ,solitary, visit there on family business, since. That was for a few days also, in Autumn 1982 and the occasion did not allow for any nostalgia trips.
This time it will be all "pleasure" (I hope) incl. a visit to my old football club near Greenford where I played up to 1964. I havn't looked forward to anything so much for quite a while and "the boy Thomas" is equally excited.
A few hours from now and......we're off !!

Many thanks again to all of you for your help and advice, incl Crazy Little Woman. I have been (myself) to Toronto & New York and both were magnificent experiences , I will never forget the almost tangible Electricity in the air on alighting at Grand Central Stn from the Am Track from Canada and emerging into the NY metropolis for the first time. That trip was also c.1980. You city dwellers lead hectic lives indeed compared to our "laid back" existence in Rural Ireland but it will be good to be among you again if only for a brief stay.
I will try to describe my son's reactions and emotions to all this real forthcoming experience on our return. It has to be better for him than seeing it all on TV ??