Thanks for the responses. I'm not sure where the wastepipe goes, but I'm currently trying to find out from someone with a lot more nous in these things than me! As for pics, I'll try to add one of the pipes from the front, and one from the side in case that helps. Thanks.
Oh, and it has...
Evening all,
I have been having problems with the sink in my kitchen for around two months. Sometimes it is quite slow to drain, but not always. The biggest problem is that there is a frequent loud gurgling, sometimes accompanied by a drainy smell. It can last for up to 15 mins.
It...