Hi Matto20v...

Just had a look at that point today and found that it is covered with a black rubber plug... I took it off and it seems to be correct because there is no other mechanism, it was simply just a plug and being kept stock standard by the previous owner would I be correct in assuming that I can just remove the black plug and stick the hose in there?

Wish I could upload the photo and show you to confirm but not sure how to do this.

Thanks again for your help. Much appreciated