Originally Posted by
KiloMIke
You could always take a short walk to the A4 Bath Road and take a bus from outside the Hyatt Place Hotel. There are several buses that go to Heathrow Central station. It will be free as it's within the Heathrow Freee Travel Zone.
Thanks. I'm back now. What I hadn't realised was that the eastern T5 Long stay exits and the T2/3 biz exits are co-located alongside each other and although vehicles are segregated, there is no fence between the two car parks at that point. I asked a bus driver (nicely) if I could walk through and he pointed me in the direction of the stop I needed. The good news was that I was back in T3 in about ten minutes, the bad news was that my flight boarded two and a half hours late!