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Thank you for your replies,some being more helpful than others! We don't have a dishwasher but the smell seems to have gone because I squirted bleach down the bathroom basin overflow slit. So a special thank you to the person who mentioned the sink overflow. Fingers crossed that might have done...

Yes the bathroom is above the kitchen and it's a combined bathroom and toilet with the toilet on the outside wall and the basin on the inside wall.The kitchen sink is at the back of the house.

Thank you for your replies.We haven't got a cess pool and it can't be affected by the kitchen sink because it's a separate drain system,the basin drainpipe is at the side of the house and the kitchen one at the back and they go into separate drains.

We have been getting a terrible smell in the kitchen when using the upstairs bathroom washbasin. The drain is clear and running freely and there is no smell in the bathroom or outside from the drain which isn't blocked as it's just been checked. Help please!