A now months-distant Invicta carried mention that a number of E400 MMCs at Gillingham had received a small rear advert for Chatham Town Football Club, their main use on the 101 running past the Club's ground on Maidstone Road (the farestage for which showed on the one-line screens on the Wayfarer 3's of my childhood was "Cem/Foo", as a random aside...), but I don't think we've had one pictured.
The light levels recently have been grimmer than grim, in one of my occasional attempts to be "artistic", here's the rear of 6558 showing the advert, with the front of poppy-liveried 6570 as a contrast, taken on 14th January, also showing off the recent resurfacing of the bus station as part of the "Waterfront Works".
Chris