Thanks for the advice EBarnacle, but it is slightly more complicated,these are not my recordings, but the player's.It forms part of a collection of his playing assembled by his Father and then two cassette copies left to two people in his will.There is very little money involved here, if any,there are so many artists and the costs of assembly so high that the collections just about cover the costs.If however they took off, or one of these recordings became a hit (which I doubt) then it would involve more serious investigation.
My decision is to go for it,the recordings to the Concertina World are too important not to include them.
Al