Anyone should be carefill if you are traveling from terminal 4 , especially. Since Heathrow express says that its takes you 15 mins to get to Terminal 2&3 and then transfer to Term 4 takes aprox 4 mins, well its not true. 20-25mins MINIMUM to wait in between this terminals and all together it wil take you same if you take underground....Its just unbelievable that Heathrow epress is not running their service in between terminals!!! How come is that different?and why you do not mention this befoe I buy the ticket??
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