This isn't terribly good - I thought I had fixed all the stuck beacon issues! Apparently not.
It turns out that in this hotel room, overlooking St Martins Place, I can see a whole lot of random crap. And this includes a very persistent little wireless client:
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Crime Prevention"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "vodafone8A1F"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Boingo Hotspot"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Belkin.44FD"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "mycloud"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "101-108"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Willkommen bei La Maison du Pain"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "WLAN-E36697"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "FRITZ!BoxWLAN7240 HB"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Telekom_ICE"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "minershotspot"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "GANAG"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "WLAN-001C4A075A8D"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "iJumeirah"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "bunny"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Vineyard Square Hotel"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Belkin.44FD"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "mycloud"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "101-108"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Willkommen bei La Maison du Pain"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "FRITZ!BoxWLAN7240 HB"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "Telekom_ICE"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "minershotspot"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "GANAG"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "WLAN-001C4A075A8D"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "iJumeirah"
[e8:06:88:8b:23:57] discard probe_req frame, ssid mismatch: "bunny"