how much is a Peter Powell Kite worth these days??

I have been left a Peter Powell kite by my grandfather and have no idea or time to use it so was looking to sell it.
Only problem is I have no idea how much it is worth. I have tried googling it but no luck and searching on ebay, even the completed listings, doesnt show up a single one!
Does this mean that everyone has one or that it will be sought after if I decide to sell it??
Any help much appreciated.

Natalie.
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You must have a young grandfather

I know someone who sold such a kite for 53 British Pounds...

I am selling a Peter Powell on ebay now. I originally put it on for £2, then asked the opinion of a kite expert online who told me to put it on for £15 and see how it goes. It's only been on 1 day and has gone up to £21.