Thanks for the comments, spirulence.
A few people have commented on the 'out of tune' part.
To put the record straight. If you listen to the original track by M'ford that intro section does, in fact include a 'discord'. The problem arose, however, in the instrumentation. In his original the two played parts 'sort of' gel together whereas, when translated to guitar parts the discord is more prominent. To be honest I didn't like it but left it in to be true to the original!! More fool me!
James