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I visited that one in Portland Street as well, it was called The Cosmopolitan when I was last there earlier in the year. Lovely ladies there, and a great choice for £40-£50 as you say Kerry lad.
I was in London ther weekend, and while the quality was also excellent I could only find places in the price ranges of £100-£150. But maybe I was looking in the wrong places as I would be more familiar with Manchester than London.
The one at 44 Portland Street was called The Cosmopolitan the last time I was there WD. As Kerry lad says, its 40-50 quid, 40 during the day and 50 at night as far as I remember. Lovely range of girls there, always 3 or 4 really nice looking girls. I would really recommend it. It is just a few doors down from the Ibis Hotel if you are anything like me and my buddies and plan your group trips to Old Trafford around a nice bit of punting