Where can I buy these in the UK/online with UK shipping?
http://www.rockywoods.com/Fabrics-Hardware-Patterns-Kits/Buckle-Hardware/1-1-2-Dual-Adjustable-Side-Release-Buckles-Black
http://www.rockywoods.com/Fabrics-Hardware-Patterns-Kits/Hook-Hardware/Swivel-Snap-Hook
http://www.rockywoods.com/Fabrics-Hardware-Patterns-Kits/D-Rings-Tri-Rings-Triglides-Looplocks-Sliders/Double-Bar-D-Ring
Preferably online 
Try a camping / outdoor shop like millets or an army surplus shop.
A look at what is currently available on eBay
 (10) 3/8 Side Release Plastic Buckles US $5.50 
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 Side Release Buckle Plastic Holes Motorcycle Half Helmet Army Green US $24.06
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 Side Release Buckle Adjustable Luggage Belt Rainbow US $6.67
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 10 pcs Side Release Plastic Buckles Webbing Straps B02 US $.01
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 Black Side Release Buckle 1-1/2" BSR1.5 US $6.31
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 100 Buckles 3/8" Black Contoured Side-Release for Paracord Bracelets US $11.99
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 25 pcs 5/8" Side Release Buckles Black Webbing Straps BB008 US $.99
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 10 pcs Side Release Plastic Buckles Webbing Straps B06 US $.01
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 25 pcs 5/8" Side Release Buckles Black Webbing Straps BB006 US $.99
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