It's probably blocked. Lift up the black plastic cover on the ground and have a good rummage. There'll probably be a load of leaves jammed down there. With any luck, the drain should start running freely once you've fished out the rubbish.
If you can't find a blockage yourself, you'll need to get a man out. There'll probably be a blockage further down the drain that he'll dislodge with a long bendy rod or a water jet. Expect to pay anything from £80 to £200 depending on how bad the blockage is. If you're a tenant, it's your landlord's responsibility to get it sorted, but he might not be arsed.
>>3135 You could try throwing some Caustic Soda down there before calling Dynorod out. I should cost less than a fiver - just follow the instructions closely, caustic soda can burn pretty bad.
