The toilet has just caused a flood and when flushing it doesn't overflow the water comes out of the shower drain

Hi Malulo:

The toilet and shower drain line is clogged. You can lift the toilet and send an electric snake down the drain or if you care to keep the mess outside and you have a relatively flat roof you can snake the drain line via the vent out the roof.

You'll need leather gloves and safety goggles.

Let us know if you'll need more info...

Mark