If there's more than 4 riders, this is classed as an organised ride and therefore you'll need group/company insurance. All single tracks are classed as footpaths and to be avoided. The police are also about and will heavily fine you.
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Culmstock area - Devon TRF Group member - KTM 690 Enduro
I've been there and done it several times with no problems ranging from the Picos to Andorra. From chats with Spanish bikers we have met ,group size depends on which region you are in.
Our overall impression has been one of friendliness and tolerance of bikers from the Spanish at large.
If you are at the next Dolphin meeting we can talk about whatever aspect you want and I have tracklogs.
David
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DGTRFYou're just passing through, make the most of it !