You can always take this to court.
It’s not unknown for people to inadvertently make the crossing.
Because the timescale between you going away and coming back was obviously a mistake, they remove the charge.
The issue then is over the £5 which you accepted reluctantly.
I’m somewhat surprised that the adjudicator then decided to reverse the penalty and impose it once again, on top of the fee. Unfortunately, it can happen when you appeal something.
You can always take the matter to court but as the original issue was set aside and then you took exception to the £5 if you go back to court, even if your appeal is then successful, you could well get the £70 overturned and the £5 overturned. However you rest then that on the basis that the whole argument is disproportionate to the amount of court time involved over what was a £5 issue, you could get court costs awarded against you even though your appeal is successful.
I know that you feel you are being bullied because this was a genuine mistake but you may win the battle and lose the war.
Your appeal to court may be successful and you may not get costs awarded against you but it is a risk that you run
Can I clarify anything for you?
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There is nothing in this which is covered under the Human Rights Act.