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You need a fanny trap
Cut down the waste pipe, install the trap, and stick a short length of the discarded waste pipe in the top
NotThamesWater
moocher
So this is how the washing machine is plumbed in.
Blue arrow water in, grey arrow water out, green arrow BAD SMELL in
2nd pic shows the outside of the house, with the washing machine outflow joining the big grey pipe
3rd pic is the whole outside, all the big grey pipes come from toilets/bathrooms
EDIT - picture order is wrong of course
My temporary plan is to make an air tight seal around the top of the pipe in picture 1
@ElephantBreath - i may have mislead you about the ubend - "The water filled U bend should stop the smell." all i meant buy this was the upside down u shaped curve that hooks the washing machine outflow down into the pipe.