That´s why they are called MAN Financial in London and most probably you are talking about GNI. ( www.gnitouch.com ), or ?
a more interesting question might be are there any retail firm (s) trading against their own customer order flow I have heard this happens in the FX "bucket" shops etc and sometimes I wonder if the same thing can happen to a small retail trader battling against the "BIG DOG" www.youtube.com/watch?v=6jooThaqeYg
MF is fine if you do a lot of volume but if you are retail you kind of get lost in the shuffle which is understandable. A decent but smaller firm a friend of mine is with now is US Derivatives. They seem to be able to deliver for him but I havent tried them yet but he has been raving. Also think Dorman does a good job in that space. Debi