Following on from jjsh, I'm drinking a bottle of my Batemans Victory Ale clone (also GW). The first bottle I tried last week seemed nice, but this one had a slight 'pear drops' aroma / flavour. A skim of my books and google suggests that the likely cause is insufficient yeast and yes I used 1 pack of CML Real Ale, for 23L of 6.5% beer, less than the recommended amount.
It's always disappointing when all that work leads to something less than you had hoped, but if you learn an important lesson from it, it lessens the blow, after all, it is still drinkable.