This is a DVD sleeve for "The Caves Of Androzani" signed by Nicola Bryant and Graeme Harper. I bought it on Ebay.

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Nicola's IMDB Entry: http://www.imdb.com/name/nm0117197/

Graeme's IMDB Entry: http://www.imdb.com/name/nm0363865/

Nicola's Official Website: http://www.nicolabryant.net/

Graeme's Wikipedia Entry: http://en.wikipedia.org/wiki/Graeme_Harper