I stayed at the T4 Yotel twice and took the free bus to T5. I had a case and it was crammed with airport workers who alighted half way at the airline meals centre. I licked my lips and smelt the air like a Bisto kid when the doors opened as the fragrance of BA inflight meals wafted over. (Or something like that). A relatively quick journey though (15 mins?). Was mid-afternoon.