Chiffchaffs too - as well as their more recognisable "chiff-chaff" song (which they don't sing at this time of year) they have a single, loud contact call.
Blackbirds' alarm 'cheep' is very loud and can be quite monotonous. We used to have one nesting in the hedge that would go into 'alarm' mode whenever there was a cat in the garden. It could keep it up for hours
Gardening on the edge of Exmoor, in Devon
“It's still magic even if you know how it's done.”
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Not the best recording: https://youtu.be/ANHY-8TVjoI
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
“It's still magic even if you know how it's done.”