Hello, Elle!
Yes, Flawless were very good, but I have not heard of them again.
1A is "Chukka", a period of play, in the game of polo, I think.
"One throwing" is a "chucker".
In 15, the tongue is "Erse", "a Parisian" is "un", with "lad"/youth reversed around "Erse", for "underseal".
My problem is my lack of knowledge of London districts (again!)
7d I have "Swami". A Hindu dignitary.
I have "a.m." for morning, leaving "Swi".
I take that to mean, possibly, SW1.
Is Westminster in SW1? That's what I do not know?
It used to be Wimbledon in SWI, in crosswordland, I think.