A lock in refers to the practice of locking the Pub’s doors after the last call to keep out the prying eyes of the law. It conjures up the picture of two guys on guitars having a jam after hours. Phil wrote this piece as a duo for himself and Fred Baker and you can hear it on their latest CD Double Up 2 from Crescent Discs (available from Discogs)
Note from Fred. ” I made a mistake from bar 38 to the end. When I spoke about the D chords I called them D minor when I meant to say D sharp.”