You can have one of the bars as Heb but what I should have added is that it could, psychologically, be construed as a bit of a waste (of your HE allowance). They're only 3.5 syns each so if you're looking for a cereal bar type HEb it's perhaps better to have say, a Kellogs Fibre Plus bar (bigger & more of choc fix) or two Alpen light bars. You can still have the Weetabix bars but use from your syns.