First thanks to all your suggestions,links and especially for the offer of trying an alternative saddle.
I do wear padded shorts and having had a look at some of the sites and reading your replies have come to the conclusion that I probably did a little too long in the saddle of an unfamiliar bike without taking some time to get to know it.
I've been using a steel framed Nigel Dean Tourace for years and its like settling into an old armchair by now. I think its been some what of a culture shock turning to a road bike at my advanced age.
The sadle on the road bike is a Selle which appear to have a fairly stable reputation and I was measured for fit (not my backside though) for the bike itself so I am a little loath to mess with the set up until I am convinced that the problem lies there and not in my impatience to have it "right".
Anyhow have been doing small local runs of between 10-15 miles of a morning without too many problems ( although still feels like I am going to end up with with 3 adams apples at times) and hopefully this will ease the way towards more comfortable riding.
If it doesnt then I will certaintly start to tinker with the saddle position or consider either exchanging it for my touring saddle or investing in something like a Brooks.
Thanks again