I have contacted companies via online. One campany who deal with Sweet william and Orgran products as well as many other speciality foods have got back to me and posted me information packs about products in depth
as well as free sample and free magazines.
Sweet william do make dairy free buttons
as well as dairy and nuts free chocolate spread (I didn't know about it!!) and they have provide me list of shops who sell buttons, spread etc. Unfortunately none of them is near my areas, so have to make special trip into city to stock them all up.
Not sure I am allow to mention name of this company on this forum? but they are very helpful