During our last little skirmish with the Hun, His Maj's Government decided that anyone who was found to be due a rebate of income tax for any reason would not be given the cash. Instead, to assist with beating Hitler, they were issued with certificates called Post War Credits. These would be refunded - with interest - after the cessation of hostilities.
Yep - in 1970-frozen-to-death, Her Maj's Government finally gave the lucky investors back their dosh. Strangely it was found that many had passed away in the interim and that relatives could not be traced "for lack of resources*". Guess where the money ended up.
Do the maths and weep.
FLJ
*I was one of those scant resources.