...so admit I should pay something. However the signage states that the charge PCN is £60 if paid within 14 days or £100 within 28 days. I had no opportunity to do either as the notification from BW Legal was the first I had heard of my error. I have contacted BW Legal to point this out and await their response. Advice from you would be welcome.
Never ever admit to liability in any private parking issue. It is about the worst possible thing you can do. You are low-hanging fruit on the gullible tree and need the advice you will receive here if you don't want to be picked off and extorted.
As requested by
@DWMB2, we need to see the correspondence between you and BW Legal. Also, show us the original Notice to Keeper (NtK). We don't need to see any reminders or debt collector letters. Just the original NtK and the comms between you and BW Legal.
No one pays PPS unless they are ripe fruit that has been plucked from the gullible tree. You are now here, so not gullible anymore, we hope.