Worn hole in Bosch washing machine sump hose

Hello Gareth. Can you tell if the hole has been caused from inside (eg. something like a nail or other object getting inside) or externally by rubbing against something? If it's definitely rubbed against something it shouldn't be hard to find out what. The main thing to consider is that the clearance you can see is not the clearance it has when full of water and a heavy load of washing.

Try getting someone to push down on the drum to simulate the weight and see if you can see what it might be catching on. Alternatively pull the machine out and fill it with a heavy load. Then put it on a rinse, stop it, disconnect from mains, and take back panel off if it has one. You should be able to see if it's rubbing against anything.

If your washing machine doesn't have a back panel you won't be able to do any of that. But check to see if the suspension is twisted. The drum should be held centrally in the casing. Cut the cable tie back if it might be the culprit.