Thanks Rob

, i firstly will try to change just the rubber pipe connector as i couldn't see all of where the complete pipe feeds through.
Do you know what the pipe does and the diameter of it?
Would this split pipe have anything to do with coolant loss (unexplained recent loss of about 250ml) or is it more brake or breather related.
UPDATE: Found an old breather pipe, cut it to length and job done!
However i noticed by the top heater inhose going into the bulkhead there is a small pipe that goes into a rubber sleeve that looks like it disappears into the bulkhead too. I can see a bit of white where this pipe goes into the rubber connector and can't tell if it is loose. Does anyone know what this pipe is and i presume the heater hose has to come off to secure / check the small pipe properley?