I have not yet paxed through T5 but, when taking my sister there last week I found it was just another modern terminal - designed by architects and accountants. I am leaving detailed comments in SLF forum to explain how the poor signs and unhelpful staff wasted our time.
Goldfish Jack
WOW what an experience! Most impressed. Time from TOUCHDOWN to the M25 was just under 40 mins.
May I suggest that the reason for that is T5 is only working at half(??) it's capacity.