These are sized for 8 species of birds that have always nested in the nooks & crannies of buildings. Those gaps are now being sealed to make our homes more efficient. Swift population has reduced by 1/2 in 5yrs.
This is huge, no birds in our towns & villages is bad for biodiversity & human MH
It doesn't seem the source you quoted (guardian) is unequivocal on this "making the problem worse". The bigger problem is assuming such things make measurable positive differences, rather than eg dealing with monocultures.
There don't seem to be any reported issues with swift bricks, so I can't see why not. Not the biggest issue in the whole scheme of things IMO, but might as well do it.
Do you remember those nature tunnels they built into motorways etc. that just became hang outs for predatory birds and animals catching things going through them
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This is huge, no birds in our towns & villages is bad for biodiversity & human MH