National Trust Touring Pass
If you plan a trip to the UK and to visit several NT properties, it may be worthwhile to register as a NT member at the first property. Individual entrances are not cheap and the total expense for a couple or a family may raise quickly.
With a membership card entrances to all NT properties are free during a full year, starting on registration date.
However, if you plan to stay just one or two weeks and have no intention to return to the UK within the same year, perhaps a NT Touring Pass is a better idea.