My understanding is that there was a hype surrounding them that caused some high prices, but they are not rare and worth pretty much face value in circulated condition.
Tantum religio potuit suadere malorum. -Lucretius "Just because you're paranoid don't mean they're not after you." -Kurdt Kobain "Language is the source of misunderstandings." -Antoine de Saint-Exupéry My Want List: http://goccf.com/t/282022
These were minted in their millions (nearly 10 million were made according to they Royal Mint) so unfortunately you haven't stumbled into a fortune this time. A collector *might* pay a bit over face if it is absolutely minty fresh, but it would likely be a few pounds at the absolute best. In average circulated condition, either spend it or use it to start your own collection :)