Pet passports are far easier to get than you'd imagine, I've been led to believe. If someone does this kinda thing full time, or for a living, or is lucky enough to be retired then this seems golden. If it was my scene then I'd call them, ask for transport and accomodation to be sorted, and charge 30p a rat or something? Im unsure what the rates are for terrier clearance but I do know what a pest controller can charge just for a feckin' callout! A lot of guys probably clear rats for free, just for the love?
Anyway, I hope someone gives them a call - the worst they can say is 'no'!
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