Fern Ticket (General)
This may just be related to "Welsh Currency", Passport control At Chepstow and a few other urban myths - I guess you produce your "Fern Ticket" at Over Bridge :-)
The Wrekin ( Shropshire) has a " A Fern Ticket is a mythical permit to adventure in The Wrekin Forest" too !
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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>