Eley Kishimoto in Snowsfields has moved their European operation to Athens(!) - the new tenants are currently doing the place up - it will be a designer men's clothing shop, but it is not quite open yet.
I think the shop your friend meant is the clearance shop on Borough High Street, which had loads of bargain mens clothes. It is/was near the George on BHS. I have bought some stuff there, but I am not certain if it is still open. Will try to remember to look on my way home.
It is still there - I can see it out the window from my desk! It doesn't have a name - the sign above the door just says "Voted the best discount clothing compnay in London". Who by I'm not sure! Its one of those discount, constantly changing stock places and today has a big red sign outside saying T-shirt sale today £1!
It's just near Rymans and Orient Espresso next to the traffic lights with Southwark Street and it's open regular hours.