The organisation, which has previously relied on press advertising and direct mail, is considering shifting its membership marketing budget to digital media.
A trial digital campaign, by agency MBA, will run next month. It will comprise two creative executions on sites including Facebook, Amazon and Guardian.co.uk.
The first ad will illustrate the range of places offering concessions to National Trust members.
The second will encourage consumers to ‘pack more into summer', as well as offering three months' free membership and a pair of binoculars to people who join.
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