There are Parmar Tailors and Royal Fashions in JLT but I think they are quite high-end.
My husband had 6 shirts and 4 suits made by Palmer - needed another mortgage :-(
However, excellent, excellent tailoring so yes, very high end!
Why don't you just call 800 Tailor and they come to you
have you tried them? i just tried googling to see if they have a website but couldn't find one.