What are the regulations in the UK governing leg-room in seated areas
in concert halls? IE is there a set amount of space between the
back-rest and front seat - I attended an expensive concert in
Cheltenham - Kiri te Kanawa - paid £75 for the seat and couldnt sit in
it as the seat in front was too close to the end of my seat.

I am considering action against them and need to know the necessary
regulatory authority to quote.

You might find it at :
http://www.odpm.gov.uk/stellent/groups/odpm_buildreg/documents/page/odpm_breg_025494-13.hcsp

I think at 4.7 of thereabouts.

This: "Limb storage facilities" at 5.18 of the regulations would be
handy for tallies like me and I assme you!

thank you thats very useful - appreciate the help!