I have had an email from Robin Gailly, the Belgian birder who guided me to observing the long-staying Wallcreeper in Dinant on 22nd March. The bird last roosted in that town on 7th April and is now assumed to have departed. I am interested to learn that it was first found (on 30th December 2014) due to a group of local birders prospecting suitable sites for the species that they thought occurred more in south-east Belgium than was previously assumed. Robin tells me a second Wallcreeper wintered in a quarry near Liège.
I like this picture of the bird on the Palais de Justice wall just before disappearing into the dark cavity above it’s head for the night.