Perhaps Charlie can explain to me why the new RAF Typhoon display team, 29 Squadron, has XXX painted on the tails of its aircraft.

The commentator at Kemble explained it but I missed the important part.
but the Romans definately made a big fo-pa when it came to designing numbers
You mean faux pas. French you know. Sorry Paul, I couldn't resist it.

The Romans never had any numerical symbols in their alphabet. Adapted from the Etruscan I believe. Using letters to represent numbers was the only way of writing it down. The numerical system most countries use today is called Arabic although it doesn't originate from Arabia.
The term "Arabic numerals" is actually a misnomer, since what are known in English as "Arabic numerals" were neither invented nor widely used by the Arabs. Instead, they were developed in India by the Hindus around 400 BC. However, because it was Arabs who transmitted this system to the West after the Hindu numerical system found its way to Persia, the numeral system became known as "Arabic". Arabs themselves call the numerals they use "Indian numerals"