Illustration by John Sadler www.johnsadlerillustration.com 

• ADDING insult to injury, some hard-pressed NHS staff face paying back money “overpaid” to them in error, (Royal Free Hospital workers told to pay back thousands in mistaken Covid overtime payments, August 5).

But more worrying in your story was the fact that the Royal Free Hospital had earlier this year adopted a private Greensill payroll app at the suggestion of former Conservative prime minister David Cameron.

How could the NHS think an idea from the man who brought us the Brexit referendum could be a good thing? Seriously, would you buy a used car from that man?

D WARD, NW1