I found this about them - a question from another forum
"Does anybody remember the chocolate bar 'Banjo'
it had two fingers in a pack (like a Twix) but it was wafer on the bottom with nuts on top and then covered in chocolate? The wrapper was purple with the word Banjo in yellow Yum yum!!!"
Strangely the other stuff I found was directly above the info about those milk & honey biscuits that Loulou was talking about!