Tuesday 2 July 1996 - British Airways operated these bouncy little Van Hool A308 integral buses around Heathrow Airport which featured large rear doors and interior luggage racking.

The indicator display on CC478 (N134 FLR), which was new in September 1995, shows 500 which I surmise could mean the crew were bound for Lisbon on flight BA500.

What appear to be water/dirt runs beneath the windows are actually reflections in the shiny paintwork from the nearby fencing.