Maplins still have shops and they still sell
components - they
had LDRs available when I needed one a few months ago.
Admittedly most of the shop if full of kits and pre-built
stuff, but they still do individual components.
Maplin still list compoents in the catalogue, but I've lost count of the
number of common devices that are 'speical order only'. At least one of
the local Maplins doesn't even keep common values of resistors in the
shop. So this does not solve the problem of getting a 10k resistor on a
saturday afternnon...
-tony