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I'm not in London any more and can't remember how many army surplus shops are left, but there used to be one in Southwark either on or near The Cut. The guy in there was really friendly and he should have webbing and buckles, but they may be £££ or only military olive green.
Alternative is to buy off ebay. I bought a bulk of 5 or 10 meters of cheap webbing in a narrow size from ebay, and had bought loads of buckles from Planet X when they sold off their POD stuff. Places like Timpsons should have a small stock of bits out back if you ask nicely if they are doing the job for you.
Otherwise it's hardware stores and haberdasheries, so somewhere like the big one called Atlantis on Tabernacle St.
Don't forget to check the charity shops, you may be able to buy a rubbish old backpack/bag of some kind to use as a donor for buckles and parts.
You could also ask about supplies from Arthur Beale (the rope shop) on Shaftesbury Ave. If they don't have it they will know where to get it.
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.