>Would you consider trapping and killing the crows? >
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Crows are smart, tenacious, and can be a real pain.
If it is legal to fire a firearm in your jurisdiction, you can, as was
suggested, just shoot them, if it can be done with complete safety.
Whether you have an ethical or moral compunction, is a diffferent matter, of
course, and the various noise making boomer devices might work. Something
cheaper would just be some fourth of July firecrackers and a sling shot..
In addition, at one time there was a thing called a ZOND anti-bird device,
which made a blasting sound on a timed basis, using propane or some such
thing.You can here something similar at the end of many airport runways.
I myself no longer hunt and believe in live and let live. But, if I tried
everything and could not get the crows to move on, I probably would end up
shooting them, if it were legal to do so in the jurisdiction.
Here where I live, discharging a firearm is illegal.
Our friend in the U.K. may have heard of Rook Rifles, low-powered firearms used
to control garden pests.
A small bore shotgun (410 bore) would be better in that it would be very
short-ranged, and would make a lot of noise so that the crows get the hint and
decide to move to a quieter neighborhood.