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Thank you for your help - I can see how a blockage such as a bird nest in the top of the soil stack would stop the sewer gases escaping and they would then find another way out (through a weak spot or joint in the stack) which would then cause a build up in the loft and bathroom. We have checked...

The soil stack does run up a recess inside the house, then through the loft and roof - rather than being on on the outside of the house. Its hard to measure but would be about 100-110mm. There is no air addmittence valve as far as I know. In the loft, the smell is no stronger near to the soil...

A few weeks ago we started getting a really vile smell in the bathroom. Not a normal 'bathroom' type smell but a sickly-gassy smell - like someone has been smoking weed in there (they haven't). I cleaned all the plugholes and it seemed to go away. But this week I noticed the same smell again...