Led Zeppelin are planning to celebrate their 40th anniversary in style - with a charity exhibition of band keepsakes.Britain's fabled superconcert venue Knebworth House in Hertfordshire is to host a month-long Led Zeppelin Memorabilia Exhibition throughout August.The show will give fans the chance to check out trinkets, gifts and merchandise the rock legends have collected over the years.The three existing members of the group - Jimmy Page, Robert Plant and John Paul Jones - reformed for a one-off tribute to Atlantic Records co-founder Ahmet Ertegun in London last year and fans have been awaiting news of a full-scale reunion tour ever since.

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