. . . I am very shocked that they have so much power (which clearly enables them to go beyond what the regulations were intended for).
You shouldn't be.
Anyone can bring a Private Prosecution - whether or not there is industry-specific legislation; and many bodies are empowered to create Byelaws which they may bring forward to a Prosecution.
From memory, there's already been one (unsuccessful) judicial review challenging the validity of the byelaws as a whole.
Convictions under the earlier versions of the Railway Byelaws were quite often overturned on Appeal where the Byelaws were found to be
ultra vires. In recent times, I am not aware of any JR, but there were two challenges by way of Appeal - Boddington took his challenge to the Byelaws to the House of Lords but it was dismissed following a lengthy analysis (
Boddington vs British Transport Police [1998] UKHL 13 ), and Inegbu took his challenge to the Appeal Court but in a counter-appeal by the CPS it was held that the mechanism of prosecuting Railway Byelaws was valid (
Crown Prosecution Service v Inegbu (2008) EWHC 3242 ).
Additionally, you might have questions as to whether the £100 sought is a fair and accurate assessment of the direct costs incurred in your case. See for example
this judgement
Is that helpful? It was a Chancery case, a matter of equity it seems, and not a Criminal conviction. The question of costs in a Private Prosecution is an interesting one, but with the potential to recover costs and compensation from a Private Prosecution through the Courts, as debated in Zinga, (
R (Virgin Media Ltd) v Zinga [2014] EWCA Crim 52) then I don't see where the notoriously frivolous litigant Perotti helps us.