I used to go under, until one year i hit the dangly rubber strips, took the overheight slip road, straight through onto a waiting train and was moving before i had time to take my seat belt off, My train wasn't due to leave for another 20 mins.
Now go overheight all the time....seems quicker and less crowded.
Last time, an A6 allroad in front of me tried to go overheight and was promptly sent to the back of the queue for under 6' I was then ushered through with a smile....Love it.

Have used both but Mrs T prefers the overweight as less claustrophobic never had a delay with either as use flexiplus well worth it - going back over in a couple of weeks and if had bought the flexiplus it would have been 400 odd return but with the block of ten last year was about 130 each way and tnext will be 140 so if you travel often enough and in peak times buy the annual block great saving

Oooops not the overweight but the overheight she won't see that so I should be safe

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Brave Man