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As per @Airhead,
and,
there may be a couple of wooden wedges, (sometimes recycled from previous wooden window frame), and some expanding foam to quickly fill the irregular void between the uPVC frame and the masonry.
The foam then allows an inadequate thickness bead of sealant to be applied giving the impression of weatherproofness.
mespilus
Thank you! This makes sense, I was wondering how it would initially be fixed into the opening - would there be screws from the frame into the brick?