TT MAC rating
of 3.0 or 3.5.
I'm being generous here. They are in Europe so clearly they've not played USTA events which means they don't have a ranking but let's imagine that London has some sort of tennis association, I'll say 2.5. I was too generous before.
They haven't spent counless amount of blood, sweat, and tears playing in the USTA to deserve anything hire than provisional 21.0, yeah, I went lower the more I think about it.
A player here on the board Topaz would naturally crush these guys.