A few questions (regarding lamda plug and pipe work)

[Hpi_matrix]

What does this pipe do (the one between the cam cover and cambelt cover)? And wheres it meant to go where it leads down the front of the engine?

http://img593.imageshack.us/img593/9584/p1011231.jpg

How do I disconnect the fuel lines? The spin round and look like they should unclip somehow, but they feel fragile and I dont want to brake them! Also which is the inlet and which is return?

http://img685.imageshack.us/img685/6480/p1011227g.jpg

Will any lamda sensor fit my car? I currently have a MK1 VTS one, but the colours on the wires dont match up.

http://img847.imageshack.us/img847/5027/p1011228.jpg

[Aaron]

1) goes to carbon cannister in wing(does crap all) for emissions/something about fuel evaporation.
2)should be a button(like a different colour) push in and pull
3) they all fit irc

[Hpi_matrix]

Which is the return on the fuel lines?