I'm hoping this isn't something serious - had new pipes and manhole put in a few months ago for a small extension, so its either going to be really expensive 'cos its not been done properly - or (and this is what I hope) - it's self inflicted (we use these moist wipe things which I recently heard were bad for blocking pipes)
So given it's a friday afternoon - i'm tempted to buy drain rods from screwfix and have a poke about - what do you think, anyone done this before?