blackbirds, unsure whether they are jackdaws or another bird any help
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Could be carrion crows?
Jackdaws tend to nest in holes, and although they will nest on cliffs they would usually choose nest sites in deeper crevices.
Carrion Crows typically nest in open locations like this, often in trees.
The size and shape of the bill is an even better clue to the species - Jackdaws have a much smaller bill (and Ravens, another possibility, have a proportionately larger bill) - and as has already been said, Jackdaws have a grey patch on the neck (not usually as distinct in juveniles, but still there).
Lat/Lng: 50.8, -0.6
OS grid ref: TQ0308