The English Record Collector magazine of January 2011 has a 1 page article about Simon & Garfunkel.
A day before their march 18th, 1967, concert in London’s Royal Albert Hall, Paul and Art recorded a TV special for Granada Television.
He was my brother
Leaves that are green
A most peculiar man
Homeward bound
For Emily, whenever I may find her
The dangling conversation
The 59th Street Bridge song (Feelin’ groovy)
Richard Cory
7 O’clock News / Silent night
A hazy shade of winter
At the zoo
Cloudy
Benedictus
Blessed
A poem on the underground wall
I am a rock
Anji
The sound of silence
The show would was broadcasted on May 2nd, 1967. And then went into to the vaults, where it probably will stay forever too. It is not likely to be released officially.
This was not the first Simon & Garfunkel TV appearance in the UK:
1966-07-08 : ITV – Ready steady go!
1966-07-14: BBC TV – Top of the pops
For more information see: www.keithbadman.com and/or www.itnsource.com
Paul Simon - 'Time it was...it was' 
The 1967 show came out of the vaults temporarily last summer, thanks to a wonderful group of volunteers who are working voluntarily to save many missing presumed deleted old shows. Sadly, I missed the showing. 😦