"TOP TIP" always force in additional waypoints to stop satnavs from creating 'shortcuts' and also ensure that these are not on top of newly completed tunnels as I (and the creator of this thread will confirm as we) went through it twice and paid the toll before I realised the problem

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Rest assured, no-one twigged on. We assumed you were trying to re-enter the tunnel before the last car in the convoy exited it. A couple more circuits and I think we might have done it, if “Dave Cameras” hadn’t bailed out earlier.
Its very entertaining to watch a mapping dispute taking place in a soft top car that’s just ahead of you.