I found this on an old thread so not sure how accurate the syn value is but I think it definitely is syns, and it's probably close to this. Only wholemeal counts as Healthy Extra B except for a few certain ones chosen by SW I believe.
Hovis Original Wheatgerm Bread, 400g/800g medium sliced loaf 1 slice
4½ Syns on Extra Easy Original 4½ Syns Green 4½ Syns