Re: Great headline!
I think I'm at about a 50/50 useless to useful ratio from Maplin.
I got a big mat of that sticky rubber stuff at least 10 years ago. I still have 90% left, and it's made mats for the oddments tray in 3 cars and a piece is stuck to the bottom of one of the remotes to stop it falling off the arm of an armchair.
Their label remover spray is seriously good stuff too. It shifted the remains of one of those security labels once.
However, I also have a box of 'ends' for a power supply that is still in the packet. They were bought for an enormous multi-voltage adapter (probably the only thing left on the planet that can charge a Nokia 2110) and never needed an 'end' that didn't come with it.
I did get a pair of £9 Sennheiser headphones from there once (they were much better than they had any right to be), and bought a box of CD-R discs from them and walked back to the car and wrote the disc I wanted on the laptop.