Left: Fleetwood, Lancashire, 53.92° N, (pre 1910) © B. Rowson, National Museum Wales.
Centre: Ardwell, Galloway, 54.77° N, 4.94° W, (2019) © J. Logan.
Right: Islands of Fleet, Galloway, 54.81° N, 4.21° W (2017) © J. Logan.
APPENDIX re range advance/retreat: flic.kr/p/2jW74ig