Are parking charges or 'fines' issued by private companies enforceable?
I know previously you could just ignore them, is this still the case?
Yes they are, always have been, but as a private commercial agreement, not in any 'legal fine' way.
Essentially, they charge for a service, you don't pay, they could pursue you for non-payment, breach of contract etc.
The problem, certainly in the past, is that they ultimately need to take you to court and present their case if you don't pay up. In most cases they can't be bothered and there is also a question whether the prices they charge are unreasonable and not supported by the court - in that whilst they may well win the court might decide the charges are unreasonable and order a much smaller settlement.
The big change recently, is that they are no longer required to track down the actual driver but instead can pursue the owner. This makes it a little safer for them to follow through with court action.
Cheers,
Nigel