We rent. I noticed after flushing the loo that I could hear water behind the cooker/kitchen cupboard (where the soil pipe comes from the upstairs bathroom). I could also see water splashing.
I phoned the landlord who told me to turn the cooker off at the mains fuse box, then asked if it was an emergency and if we could cope with it till next week.
To be honest the thought of water from the loo, running behind the cupboards and cooker, not being able to use the cooker for days doesn't appeal.
I managed to move the cooker. There is a lot of polystyrene that was in front of the stack (never noticed it before), most of it is lying in pieces on the floor, and when the toiler is flushed you can see water dripping.
I filled a bucket with water and poured down (without flushing), to see if was related to the cistern instead of the pan, but that also has water running down.
I'm scared as I was told if they come out and it's not an emergency I will be charged £££ which I can't afford, but don't like the idea of water running into the kitchen every time nature calls. Also if I was told to turn the cooker off at the fuse box, surely that is an emergency?