At worst, it is legal tender in Britain and it is worth Five pounds.
The British decimal Five Pound coin is intended to be a Commemorative coin or for serious collectors or investors.
Any value above Five Pounds would depend on the condition of the coin, what it is made from, the year and possibly the design.
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You do not state the nature of the misspelling.
The 2005 British Two Pound coin, 400th Anniversary of the Gunpowder Plot commemorative, should have -
"Elizabeth II DEI GRA REG FID DEF" on the obverse.
"1605 2005" and "TWO POUNDS" on the reverse.
The edge inscription should read "REMEMBER THE FIFTH OF NOVEMBER".
Any coin with a "genuine" minting flaw would have some value, above the usual, as a collectible coin.
Genuinely flawed coins are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the minting process, and have escaped detection during quality control at the mint therefore, a valuation cannot be anticipated.
A reputable coin dealer should be able to identify and confirm the coin as genuine and make a valuation.
That would be the 2005 British Two Pound coin commemorating the 400th Anniversary of the Gunpowder Plot.
The edge inscription should read "REMEMBER REMEMBER THE FIFTH OF NOVEMBER" but reads "PEMEMBER PEMEMBER THE FIFTH OF NOVEMBER".
These coins described as "rare" on eBay, do not seem to be generating much interest which is surprising since the Royal Mint does make many errors of the magnitude.