http://www.liverpoolecho.co.uk/news...cyclists-investigated-mersey-tunnels-10663935
Looking at the video they seem to be capable of "proper control" of a bicycle so don't seem to have broken any laws.
I agree, they should plead not guilty.
The video doesn't disclose a great deal, other than cyclists riding where they were legally allowed to do at that time of night.
There is the statement from one of the lads to say they had been on a night out and they'd 'had a few drinks', but that shouldn't be enough to convict them of cycling under the influence later that same night.
The lad does say 'we wouldn't have done it if we were sober', but the comment about sobriety is one anyone could make about having a few drinks.
Presumably there's no medical evidence.
The video and the comments are not enough, in my view, to satisfy a panel of magistrates so that they are sure the cyclists were drunk.