How to pronounce the letter ‘w’

The greying bespectacled chap, probably in his 50s, is conducting the survey on behalf of the government and towards the end of the tedious session, asks to confirm my name.

‘The surname is…?’

‘Chew. See-Aitch-Eee-Double U.’

He writes, ‘Cheuu’.

“Er sorry, it is not two ‘u’s. It is one ‘w’.”

The muppet scratches his head. “Yah? Double ‘u’s right? Two ‘u’s.”

I am beginning to doubt his intelligence. “No. I said ‘w’. Double U.”