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The other side of the wall is the adjoining neighbour's extension. The houses are on a slope and our kitchen extension is a little higher than theirs, so it is another potential option. Not great access on that side though.
Not sure what to do yet. A top vent straight through the roof is my preferred option if I do it myself - seems the easiest route to cut and the neighbour across the road is a roofer who is generally quite helpful.
Familyman
What’s on the other side of the wall that the cooker hood is mounted on?
You can get rectangular ducting which might help keep things tidy.
220mm x 90mm rectangular ducting is equivalent to 150mm and is air brick vent sized.
Also if you decided to replace the cooker hood, you could get a matching cooker hood cabinet and run the ducting above that.