I live near Hankley Common, near Elstead in Surrey (where they’re currently filming the new James Bond film) and we see Chinooks all the time, flying high circuits during the day. As soon as it gets dark, they switch to night vision and start terrain following going to the drop zone at Hankley.
We’re at the bottom of a tree lined valley, with 1 in 7 hills going up from 73m outside my door to 110m on the hills either side. The Chinooks come down there so low, in the dark, that they’ve blown the smoke back down into our log burner!