@leela, just to clarify, in case you aren't aware, the man is entitled to the honorific Sir, since he has been knighted. Unlike in the southern states of the US, this term is not used generally in the UK, only for those with knighthoods.
(My father was from Alabama so insisted we all use sir and ma'am for our elders, he couldn't understand why my children didn't do the same, as to him not doing so came across as disrespectful.)