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Sorry I didn't realise that you meant this. Tell them to fucking do one. Yes, this is possibly not allowed now (I'm a chippy not a plumber) but 30 years ago was so common that you could buy plastic covers to prevent leaf build up from affecting how your washing machine drained.
If it's only grey water it won't even matter if it goes into a soak away.
@princeperch is bang on, also I'd be tempted to ask your solicitor to find out if they know the surveyor because that is a really petty thing to pick up on.
How would you find that out?
Our setup is the same as this video where the plumber is fitting the waste into this drain: https://youtu.be/xN9WTJywZDc
so I’m a bit confused