[quote name='skankdelvar' timestamp='1368307055' post='2075623']
Dunlop plastic strap locks. Useful in an emergency. About £1.99 for two.
[/quote]
Plus a massive one, was just fiddling about with one of them when I saw your post. Excellent for stress relief, there's something so satisfying in playing about with them when you're bored.
And I suppose they've helped once or twice with stopping my strap slipping off, too.