Altho' I replied yesterday (from a mobile), because the question seems to be still live, here's the gist of what I said. " This is not my tour; we took Duncan's tour and enjoyed it, so I thought I'd let the TA community know it was good." something like this anyway!
I guess if you were talking Saturday last week, this is all over and done with and you either met Duncan ... or didn't, but I hope you enjoy Bristol as much as we do. MW