Re: Cragside, worth multiple visits
Quite a lot of similar organisations have reciprocal arrangements. English Heritage has one with Cadw (the Welsh equivalent) so you can get into each others' castles at free or reduced rates.
Does this explain how Edward I managed it?
Walks up to portculllis. "Yep, there's 1,000 of us and we're all English Heritage members, so should get in free. We'll have the afternoon tea later though... What? Those 2,000 scruffy guys over there with the bows? Oh they're our butlers."