That sounds very frustrating and possibly illegal! I'll have another look next time I'm up there. Are you sure the PCN is for accessing the area and not for parking somewhere you aren't allowed to? I don't think the road is private, it's a locally adopted road as far as I know. The council do implement school streets and some no-through-roads but this should always be clearly signposted.
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            Published using OSMCha: https://osmcha.org/changesets/133949710
            