Grrrr! 
Spent an hour queing up from J3 to the booths, only to get there and find the right bore closed. NO gantry warnings. Even the radio went out of it’s way to say “The bridge is still open, two lanes only” to give no clue that there would be two-way traffic through the tunnel, involving shutting the RH bore.
Had a go at the booths about putting it up on the damned gantry signs, before getting turned around in my 16’ decker. ARRRRGH! 
Still, looking on the bright side, last night could have been a lot worse, especially for decker drivers everywhere as it was.