Ok, that didn't quite go to plan.
Thanks sbunter for the help. When I checked, my dna was in fact linked to our tree. It offers three "probable" matches, two of which I know to be accurate, together with 66 fourth to eighth cousins, most of which appear, as others have said, to be little more than the usual Ancestry hints. What it does not show is my connection to the second cousin, who reports that his tree does not show a connection to me.. We are both somewhat puzzled.
Keith