Country diary: The house martins are gone, but not forgotten | Ed Douglas

Lockerbrook, Derbyshire: Their migration is miraculous, yet still not completely known. But they were here, and now they are not

The sudden absence of something, even though you know it’s coming, can dent the heart a little. The Japanese, inevitably, have a phrase for it: mono no aware, the pathos of things – and by things, in this case, I mean house martins.

Last week I had stood in the same spot, looking across the same valley. The weather then was much the same as it was today, low‑angled sunlight through patchy cloud lighting up the yellowing birch leaves and bronzing moors on the north-eastern slopes of Kinder Scout. It had picked out the spread wings of a buzzard a little below my eyeline, along with a haze of large insects, which in fact, I quickly realised, were house martins.