This is not about Old Jamaica Bars ( I remember the television advert with a voice similar to Robert Newton's Long John Silver, saying, "Old Jamaky", or some such guff). Not a pleasant confection. I recall it had that nasty faux rum flavour. A bit like the disgusting Wall's Rum and Raisin emulsion which passed for ice cream.
However, the Tiffin was a substantial snack. Not only chocolate but crushed biscuit ( and not that aerated Ricicle stuff, but bits of digestive) and raisins. I remember buying it from my local sweetshop/newsagent and I think it was 6d a bar. Was it in an orange wrapper? Who made it? Is it still on sale?
I must be told to get some relief from these sleepless nights.