I'm finding little of use for the specific song you're looking for.

You mentioned the name Chris Sommerville earlier upthread. Does this Chris sound/look like the correct Chris? https://www.youtube.com/watch?v=R9O_myn94bU

Depending on how confident you are that that's his name you could try looking for Chrises that meet the criteria.

Or perhaps the pub itself could aid you in your search: http://www.theoldcrown.com/