The suggestion from my noble friend was that it should be used in all cases. I have conceded that we should use it in some cases, and I cited an example from the Terrorism Act, where we do indeed use the word they in the singular:

“It is a defence for a person charged with an offence under this section to prove that they had a reasonable excuse for their action”.

But to insist that it should be used in every case would be to deprive parliamentary draftsmen—parliamentary drafters—of the flexibility they need.