Just noticed a bit of oil around this pipe highlighted 1 below, should this be leaking and its quite loose and is easily moved but the lip on the male part stops the pipe coming off completely.

and maybe of interest to some piv34uk pointed out to me that the pipe below the inlet manifold near 2 may have split as hes found a few which have and after some searching this aft there is a definite hiss down there.

anyone changed it? easy job?

Yeah I've just changed the one under the inlet manifold, quite fiddly but easy enough. I had no fault codes car was just a little jerky and from cold start idle was a bit erratic.Mine had 2 splits about 1 inch long.

http://briskoda.net/forums/octavia-i/boost-leak-help-part-number-please/110638/