A couple weeks ago I received a red pay on answer payphone from an Ebay seller located in the UK. I have tested it and it rings when called, and the speaker and microphone work. I cant test the dial due to the fact that we have U verse here and it dose not allow for pulse dialing. However While the coin slots pen when the polarity is reversed the mechanism dose'nt work right (I bought 5p coins from the era on ebay). Dose someone have a manual for the coin mechanism? Note the out of service sign is stored inside the pay phone until its needed its not like that normally.
I believe the diagram for this phone is N835:
http://www.samhallas.co.uk/repository/n_index/index.php?dir=0000/&file=N835.pdf
Though I don't know if that will cover the mechanics of the telephone... :)