You'd be surprised how many people at the till still say "how much is that then?"
Anyway, they sell all the usual pound shop stuff; sweets, plastic flowers, unknown brand batteries, blue powerade that no doubt makes your brain itch.
They also have an aisle that has random bits of tech. So I thought I'd try some out.
The first I tried was a micro bluetooth USB dongle. I took the lid off it to make sure it wasn't just going to short out and burn my PC to the ground - it looked ok, so I tried it on an old sacrificial PC.. and it worked just fine.. Not the fastest in the world, but functional.
The next thing I tried was the headphones.. Not quite so successful as the cable is only about 750cm long, and my tower PC is on the floor - so I end up stooped over to hear anything. Also the plug seems to be a little bit too short, and you have to really wiggle it around to get both speakers working correctly.
Next - A "Blakberry USB charger cable" - yes, that's how it was spelt. It's actually a standard micro USB cable, I checked the pins using a multimeter and they appeared to all be connected as they should be. Tried it on a sacrificial PC again, and an old phone (paranoid much?!) and yep, worked first time - full data connection. Not bad for £1.
They also do car phone chargers, watches, HDMI cables, SCART cables, and all manner of things with LEDs in. All good stuff for future projects.