there are number of sub-categories referred to on ebid as dig down levels that need to be set up in order to encourage other sellers and buyers to migrate from elsewhere,
In particular the current Elizabeth II other is too wide ranging, i would recommend
Elizabeth II commemoratives
Elizabeth II definitives
Elizabeth II Regionals (though this could be a category at the level above Elizabeth II)
i would also duplicate the sub-categories for Commemoratives and definitives below George VI or set them up at top level within UK stamps
you also need a category for booklets and then sub-categories for
Folded booklets
Prestige booklets
Barcode/Window
Stitched
i also recommend setting up
PHQ Cards
Postage Dues
Officials
hope this helps