Today I was very lucky. When exiting Hatton Cross Station the first bus my eyes laid sight on was DPS715 on the 285. This route is usually served with 10.2m E200's and DPS's rarely stray onto the route. Route 285 runs from Heathrow Central - Kingston and is operated by London United from Hounslow Heath (HH) garage
Route 285, London United, DPS715, SN55HKW, Seen at Feltham Station