Re: Great headline!
I spent an hour wandering around Maplins last week - again, I didn't actually need anything. After inspecting spray cleaners and lubricants (IPA yes, acetone no, alas), flashlights, something called Sugru, and some self-adhesive magnetic tape, I came away with a USB-OTG cable, three little keyring screw cannisters for storing small things, and a microSD card which was, amazingly, very reasonably priced.
I did notice that they were selling microHDMI > HDMI cables for £45, whereas an independent computer shop near me sells them for £6.00.
Still, being able to get parts for a project the same day is often invaluable.