If you have to do it (and we all do) squat over a page of newspaper wrap and pop in a carrier bag, toilet paper too. Take it home and bin it, simple. It’s not really different to collecting your dogs mess. Nappy bags are ideal for this, cheap and easily tied up.
A good trick on climbing trips I learnt is go before you set off and take Imodium which should bung you up for a 24/48 hour sesh.
A locked gate behind poysers pond in the otter fence could be good, could nip through from catfish corner/ambush alley end and use the portaloo between olvers/grimshaws.
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