I was very impressed - up to a point. I thought that the storytelling, through the lyrics was really excellent, but the music was not very tuneful - everything sounded pretty similar and I have to admit that I found my attention drifting after a few songs. The best song for me was Jock the Singing Welder - the Underground River was good too, also the folky interludes.
I was wondering, whilst watching, why on earth didn't Sting perform the musical in the first place, alongside Jimmy Nail. If he had it might have been a success. I also thought about MK doing a similar thing with Local Hero, but couldn't imagine it at all. After all, Sting has done a lot of acting and he is much more of an extrovert than MK and much more eloquent. Anyway, if LH is the mystery project, Mark won't be appearing on stage I'm pretty sure.