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If you're handy you could do this yourself, buying some webbing and a side release buckle of your choice, or ghetto it using a belt and buckle.
Any cobbler should have a 'patcher' (strong sewing machine, old school Singer, mostly hand operated) and could do a quick job, especially if you bring in the materials pre-cut and ready to stitch on.
The best technique would be to buy yourself the materials and do it yourself, using a 'Sewing Awl' if you don't have access to a good machine.
I have one like this. Pretty sure mine is this one, but there are others like this. Grab some contact adhesive and glue the strap in place before sewing it, and then learn how to use the awl. You may need some seam sealant if your bag was supposed to be waterproof.
Or go absolute ghetto and use stick-on velcro.
pdlouche-
Amazing, thank you so much - I'm not averse to doing it myself at all, just didn't think I'd be able to do it properly without an old singer or something so this is good news. Next question - where would you recommend for webbing/straps? Tried looking a bit before but couldn't find anything that suited hugely.
kimchi
Hey - might not be the right thread so apologies if so. I was just wondering if anyone knew of somewhere in London that would be capable of adding a few straps and buckles on to a Timbuk2 messenger sling? I bought it cos it was cheap in schmEvans and what I was looking for, but it only has velcro closure or a design using a U-Lock to hold it closed. It only works when the bag is filled just right - too little and the lock drops out, too much and the lock doesn't fit. Any help or direction would be much appreciated.