Just remembered the pair of F-35s I saw low-level over Somerset last Thursday. Aiui only RAF jets are in the UK at the moment. Nice to see them out in the wild for the first time.
Looked like they were nearer 500' than 250', crossing in front of me a few hundred metres away. But what really struck me, having seen them display at Farnborough where they were plenty loud, was how quiet they were doing "real" flying (even as they rolled and pulled into a 90deg turn it away from me). Far quieter than fast jets at that height and distance usually are. Really are low-observable.