With an apology for eavesdropping Ruth I thought Jim was gonna buy some equations... I think it were my dad they would have to have a large number of polynomials extremely quadratic and set as a simultanious problem where you have to find the x and y values via finding the values from the rest of the alphabet!!! You can tell how much I love my dad ;) lol

Am still reading the programme from Sunday :)

Surrey Singer, I liked your comments about the RAH. The only thing is I am sure the acoustics were totally different in the hall pre-amplification. The odd shaped upside down mushrooms were put in to deaden the reverberation from the pretty corregated ceiling in 1969 according to wikipedia, I love the addage in there that says "It used to be said that the hall was the only place where a British composer could be sure of hearing his work twice.". I couldn't imagine the resound in the original hall since chairs and other materials have been changed and added since.

Royal Albert Hall - Wikipedia
PDF research paper into the acoustics of RAH before and after restoration

I am sure there was a documentary of the analysis of the acoustics of the RAH but I can't seem to find it... I know quite a few great folk artist that could perform there without amplification :D