The only Alpens that are a Healthy Extra B choice are the "light" versions (you get two for a HEXB). The regular versions are not a healthy extra.
As far as I know, the only flavours for Alpen LIGHTS are:
Apple & Sultana
Summer Fruits,
Choc Fudge
Choc and Orange
Double Choc (a new variety)
I've not seen a coconut version personally, so cant be sure if that's a light bar, and therefore healthy extra