Could I also use the fact that that the period in which the notice must be paid is wrongly stated as "period of 28 days beginning with the date of this notice"?
No, it is actually correct. The Act under which this PCN was served gives the period for payment as from date of service, but period for submitting reps is from date of service, which is barmy, (but that is Parliament for you !). Councils, and indeed adjudicators have struggled with this ever since the Act came in.
We've seen this location before, but I can't remember how it turned out. However, it is clear from looking at GSV that the entry to Croome Hill was closed in 2020 : -
Find local businesses, view maps and get driving directions in Google Maps.
But then it is miraculously open again in 2022 !
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and this seems to have continued for the next two years, and is shown in the last GSV view of 2024 as open: -
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Note that the planter boxes are always there. I suspect this closure caused a huge row in 2020, and it is only fairly recently that the restriction has been reimposed.
So in the absence of an up-to-date GSV view we need to see what is there now. You say there is no escape road, but there are two side streets before the restriction and the street is fairly wide, so I don't think that is a winning argument, frankly. What can win is adequacy of signage. You say there is no advance warning sign so that is something to emphasise. However we really do need to see what's there, so if you are prepared to do some legwork with a camera, (your mobile phone camera is sufficient), please provide some up-to-date photos.