The eighth filmatic instalment of the Potter saga is expected to be the last, having now dramatised each of JK Rowling's books.

But this isn't the end for Potter fans, as the young wizard's adventures are expected to continue in the collectibles market, where several furious battles have already taken place.

We expect the Harry Potter collectibles market to leap forward in 10 to 15 years' time, as childhood fans of the books and films start earning a wage and buying up the pieces they could only dream of as kids.

Here are our top five Harry Potter collectibles, all of which could be worth substantially more by the time its hero has settled into comfortable middle age.

5: A signed first edition Harry Potter and the Philosopher's Stone

This book was inscribed by JK Rowling after her first major newspaper interview, with Elizabeth Dunn of the UK's Telegraph.

Dunn smoked during the interview. JK Rowling had recently given up cigarettes. She inscribed: "Breath some more smoke my way! JK Rowling". The first edition of the Philosopher's Stone had a print run of 500. 400 went to public libraries, leaving only 100 on sale to the public.

As rare as it is coveted, the book sold for $24,000 at a US auction in February 2010.

Remaining first editions occasionally appear on the private markets, while Rowling's signature alone can attract considerable interest.

4: A 19th century globe featured in the Philosopher's Stone movie

This 30 inch terrestrial globe was produced by W & A K Johnston, and was immortalised in Harry Potter's first big screen outing back in 2001.

Touched with Hollywood magic, the globe was sold at a Sotheby's auction in July 2001 for £17,750 against an estimate of £8,000-12,000 - testament to the impact of the first Harry Potter movie among collectors in the first year of its release.

3: JK Rowling's childhood home

Rowling spent part of her childhood at Church Cottage, in Tutshill, Gloucestershire. This cottage, in a picturesque part of England, close to the Welsh border, is currently on the market for £400,000.

Although few collectors will have the finances to purchase what may be seen as the ultimate JK Rowling collectible, lesser items are more within budget.

For example, the chair JK Rowling sat on while penning the first two Potter books from her Edinburgh flat sold for £19,555 in July 2009.

2: The original art work for the Philosopher's Stone front cover

A pencil and watercolour signed by the artist Thomas Taylor was sold in July 2001. As the first book's cover, Taylor's image was the public's premier introduction to an image of Harry Potter.

It was auctioned at Sotheby's in July 2001 for £85,750. This amount is especially impressive considering the artwork was estimated at £20,000-25,000.

1: The Tales of Beedle the Bard

The Tales of Beedle the Bard is a collection of five children's stories written by JK Rowling before she hit the big time with Mr Potter.

The £1.95m edition of Beedle the Bard

Just seven handmade and handwritten copies of the book were made by Rowling, which helps explain why one sold for £1.95m at Sotheby's in December 2007, against a £50,000 estimate.

Not afraid of a little self-promotion, Rowling mentions The Tales of Beedle the Bard in The Deathly Harrows, when Hermione receives the original copy in her stocking.

The book offered Harry and his legion of fans clues and symbolism relating to the final throes of the tale.

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