It's been steadily cutting a dash in a quiet enclave in trendy Marylebone. Before he got the top job, Tony Blair used to shop here. Mercer is filled with softly constructed menswear (casual weekend wear, trendy business suits, and a hint of formal evening attire) in more unusual fabrics sourced and made in Italy. The soft tones and styles don't scream fashion but show a quiet cut of confidence. The staff is delightfully helpful. Tube: Baker St.