Hehe yep.

Actually, it goes through 2 walls and a floor!
The cable is already in though, which is why I was asking about adding to one end of it rather than replacing a section of it because the section that would need to be replaced is the crossover, which is the one that goes through everything.
The reason it`s in 2 parts is because I was intending to see if I could make it through a `short-cut` with 10M of both types of cable (to give a choice of cross or straight) but it didn`t work out so I had to go the longer route and concatenate them. The cables are both pre-moulded types.