Are you asking if you are liable?
Well, yes. Private land fines are enforceable. In fact, they always were. They were just very hard to enforce which is a different point entirely.
They are still not particularly cost effective for them to enforce so there is a good chance of escaping.
The issue is just whether you want to run the risk of being sued.
It is likely that you would escape liability if you did refuse to pay but you do need to be aware of the risk.
Can I clarify anything for you?
It depends whether or not you have acknowledged it within 6 years.
Then time starts to run again.
No, it runs from the date of last acknowledge.
the last acknowledge is very unlikely to be the date of issue.
It does depend how you respond but basically you are right.
Any acknowledgement is adequate to start time running again.
Well, it depends how you respond but the danger is very great that would be right.
It is better to ignore these things anyway unless it is actually a court summons. However you respond they are not going to agree with you.
Yes, that is potentially an acknowledgement.
There is no point in sending that. They will not be deterred by it anyway.
Yes, if they do summons you can admit the claim, part admit the claim or defend it.