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The 13A has a little breather on it which doesn't connect anywhere else. Bit like an oil catch can if you delete your PCV. Part 39 and 17 on the diagram.
I fitted a cheap EGR off eBay and it wouldn't adapt, but it doesn't throw a check engine or emissions workshop light. Solved the issue though (stumbling idle/stall when hot) so all good.
 
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