It comes down to the old question off how much use you will make of the membership. If its only a few visits a year then individual entrance charge is your best bet.
On the other hand, if you go for membership then this will encourage to visit more places in order to get your moneys-worth.
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On the other hand, if you go for membership then this will encourage to visit more places in order to get your moneys-worth.
New Zealand heritage
or
Scotish National trust