Thanks Roger, useful info but sadly the photos did not come out

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I have now managed to get the old one out but still struggling to get the new one in now!
When Jay says "The manifold can then easily be fed up into the inner wing aperture if it is turned around 180 degrees as in the photo." do you think that means feeding it in from the under the wheel arch and into the engine bay? I've been trying to feed it down from the engine bay the same way as the other one came out!
If anyone can see the photos could they just clarify for me please

Getting the old O2 sensors off is proving tough too, I've left them with a generous squirting of penetrating oil over night now !