cm201.
From your thread there is no hope of these debts being ever paid , therefore it is time to get closure.
If you can or wish to, have your father authorize all and every contact through yourself .(that takes some pressure from him)
Advise all these companies of your fathers actual financial position.
(do not get locked into long -winded forms to fill out . A simple showing of his small pension and he having no assets will do)
Advise them of your fathers health position.
Most companies keep pressing whilst they get any funds , they will normally back off when it is clear that the customer cannot afford to repay.
At this stage no need to tell them to gt stuffed. Keep records and copies of all correspondance. From what you say matters should be rsolved within a couple of months.
There is ABSOLUTELY no way any Company can chase children for fathers debts.
You say he has no wealth, bottom line therefore is that if you present the true facts to them they will effectively go away.
ps . Do not answer private calls from them (hardly ringing to say you won the Lotto!)