Great little locksmith/diy store/door handle shop bang on Wandsworth High Street right next to the chippy. I went in to get a key cut and was presented by an extraordinary man who looked like he’d jumped ship from a pirate vessel in Morocco and didn’t talk to me. Or anyone else for that matter. The job was done in a couple of minutes and cost about four quid. Can’t say fairer than that. Apart from this service, the shop is the perfect place to pick up random bits of diy at cut prices and is a generally useful place to know about. Very local, very basic, but very good. Also does engravings.