Originally Posted by
henkybaby
I was wondering about that... Good!

You will have the 'pleasure' of Pier 4A at T1, which is one of the most horrid parts of Heathrow IMO. It was designed as a temporary structure in the early 1990s to solve T1s growing capacity problem, and still hasn't been demolished
At least you get to walk straight out from the domestic baggage reclaim hall into the check-in hall without any immigration/customs queuing.