Quick release strap

My uncle has this quick release strap thing on his strat and I can't find them anywhere. They are very similar to the type of clips you find on rucksacks and sports bags. I've heard them called cliplocks and straplocks but am at a lost point as it is a little annoying taking the strap off every time you want to put the guitar in case. Any help would be much appreciated as to where I can find one, bearing in mind I'm from England.
Cheers fellow guitarists!
Luke:)

Try some of these. I use Dulop Straploks on all of my electrics.