That's what I assumed Fred but as it was single I was wondering if there was a special issue "sampler" tied in with the book but I guess it's just the Topic set.

In fact Walthamstow Folk Club has had an email from Peter Cox about the launch at it mentions 4 events

10 May at 3.30        Birmingham central library lecture theatre
18 May at 10.45        Shepley Folk Festival
20 May at 6.30        The Sage, Gateshead
25 May at 3.15        Blackheath Concert Halls recital room

These are/were apparently before concerts on Peggy Seeger's tour so I guess the June event in Leytonstone is a special with the author giving more of a talk and leading a discussion so should be very interesting.