If booked for T5 then it's now for collection from the Holiday Inn near to the T2/T3 connector on Bath Road. So the new HI and Staybridge which you've probably seen during take off and landing on the northern runway . The shuttle bus runs from T5 bus stop 25 on the Arrivals floor, or TfL bus 423 if one is about to roll out. If HBO it may be quicker to actually leave Heathrow via Flight Connections and T2. then the very regular TfL services from Heathrow Central to Newport Road. Despite the fact it is much nearer T2 / T3 than T5, this is the designated Avis location for T5.