Hello Susan, I am Keith, one of the experts on Just Answer, and happy to help you with your question. Your father would have been, like mine, he worked for the BBC, a Reserved Occupation in WW2. Remember some National Servicemen (notably Eric Morecombe) were sent down the pits, known as Bevin Boys (one in ten if I recall)
I presume that you are referring to the wartime with holding of some of the earned income [Post War Credits] to assist in the war effort, a form of compulsory savings. They were, if I recall, redeemed by 1973; I remember my Mother speaking of them. I suggest that you firstly approach HMRC in this matter, although there activities will be limited as their files will certainly not go back that far and furthermore any claim would be barred unger the Limitation Acts. But soft, those Acts allow tax claims to be made by HMRC indefinitely so conversely so should the redemption of tax credits be available. Quite frankly though, I am astonished that they were not paid off long since. You could try applying to HMRC for recovery if you have the documentary evidence. This is Money web site advises that if the certificates are not stamped cancelled then they can still be redeemed. The procedure is as follows:
'To request a claim form or repayment, contact Revenue & Customs at HM Inspector of Taxes, PWC Centre V, Llanishen, Cardiff CF14 5YA. Call 02920 325770.
Alternatively, there are collectors who might wish to buy the certificates, or you can hold them as part of your family history.'
The matter of a claim for medical conditions is a matter for a solicitor. However, the NUM are very hot on this and have their own legal advisers who can assist. I am a mere accoutant and unsure on whether such claims die with the victim.
I do hope that I have been of somce assistance to you in this sad time.