I am immediately suspicious of this PCN, the first we have seen, I think, from Liverpool for a yellow box junction. In the first paragraph of the text on the PCN, it refers to the location being part of a bus lane or gate, yet this is totally irrelevant, because the alleged contravention is stopping in a yellow box junction when prohibited. My suspicion is strengthened when I look at their website, which only refers to Parking PCNs and Bus Lane PCNs. Clearly they have done nothing on their website to update it to reflect that they are now enforcing moving traffic offences, not just bus lanes. Council incompetence and stupidity strikes again ! what a load of tossers !
I reckon this PCN is just a quick cobble by some idiot in Liverpool council using the previous PCN template for their enforcing of bus lanes under the old 2007 regulations. Therefore it is very important that you post the rest of the PCN so it can be examined for errors of content that could make it void. The text related to bus lanes is not a winner at adjudication on its own under "procedural impropriety".