Thank you both for getting back to me, I really appreciate it and I am in total agreement that its sh*t!
I don't have the exact measurements to hand sorry, but the joist looks like it has been cut towards the end which is even more alarming. The room downstairs is the kitchen, and was an exact footprint of this particular bedroom, however that kitchen wall was removed some time ago with an RSJ installed. I need to take up a couple more boards to see what the end of the joist sits on and how far from the edge it has been cut so I will do that tomorrow. I am pretty sure the cut end sits on bricks but will confirm.
The joist is located just in front of the exterior wall, as shown in the additional photographs.....which I should have uploaded before sorry. The end of all of the floorboards sit on the joist in question but I do not believe there is any section of solid wall sitting on top of it. Regardless, I am still concerned.
I really do not understand why the contractor has done this when the hose could have been fed right to left between two joists and out the side of the house......which would have also made core drilling from inside much easier from a space perspective.
Thank you for the advice links, they are so useful.
I know that contractor will say that its only one joist and its absolutely fine but I don't buy it. Do you believe that I need to bring somebody competent out to look at this?
Many thanks
John