My father was West London Area Manager for the GPO, and because he had qualifications in the new electronic telecommunications system, and was on the London Flood Committee etc (in the early sixties) he was asked to go to Kensington Palace to set up a new telephone exchange there and arrange for telephone security for Princess Margaret and her household.

She sailed in to talk to him and was revoltingly arrogant and dismissive. She spoke to him like dirt, and thought she knew everything there was to know about telecommunications.

She'd picked the wrong chap though. My father was quite conformist and had fought in the War in the RAF, but he never kowtowed to anyone (and why should he?) He didn't bow (neither would I have done) and merely replied that if she already knew all about it, he'd be happy to leave, as he was a busy man!

She was concerned that when speaking to 'Mummy' (the Queen Mother) people couldn't tap her line. He got her under control and explained about the system he was proposing and how tapping the line would be impossible. My father was very very strong and firm (as I knew to my cost) One didn't cross him! She eventually seemed quite pleased and they parted amicably (still no bowing)
But he said afterwards he wouldn't give the Royals the time of day.