Could the pipe work not of been fitted at 90 degrees rather than joined like that?
Is the roof to the right in the photo a neighbours property?
Yes it is.
Opinions please.
Flue not petty but looks fine to me as it is seems to be 300mm (ish) from the boundary.
As above, box in the boiler, or just the bit above the boiler, allowing access to the flue and filter.
It would look very much better
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