Back in the early 1970s, I had dinner at a cheap and cheerful Chinese restaurant (Lido, which still exists in Gerrard Street) with about 7 friends. 5 of them were studying to be chartered accountants, I was completing my PhD thesis, and ‘J’ had only the most basic of educational qualifications.

The bill arrived. It was £24 for all that we had eaten. That seemed about right. The bill, consisting of three pages stapled together, was examined by all of us.

When J looked at it, she said it was twice what it should have been. This was because the waiter had added the sub totals at the bottom of each page to the individual prices which added together were equal to the sub totals.

We ended up sharing a corrected bill of £12.

What concerned me was that 5 people who were about to become chartered accountants missed the error in the bill which they had perused. Would you have trusted them with your money?

Incidentally, J went on to become a very successful business woman, probably more prosperous than anyone else sitting around that table in Lido.