LBS recommend

Any LBS in South East London that can be trusted to do a decent job of re-indexing some gears? Should be a 5 minute job but I need someone who knows exactly what they're doing (I.e. not the Dr Bike people who messed them up or the LBS who subsequently replaced my cassette and chain leaving the indexing still a bit crap)

Josef's Cycles on Friary Rd - between Peckham and Old Kent Rd. They are awesome and their pricing is astonsihingly competitive.