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
 2" WEB DUTY BELT HEAVY POLY WEB-SIDE RELEASE BUCKLE 72" US $11.90 
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 2" WEB DUTY BELT HEAVY POLY WEB-SIDE RELEASE BUCKLE 60" US $10.90
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 2" WEB DUTY BELT - HEAVY POLY WEB-SIDE RELEASE BUCKLE US $9.99
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