@Ken 16 Marketurds
I live in an area of London with blocks of flats popular with students from Korea, China, Japan. Cost of shipping possessions home at end of stay means a lot of stuff gets dumped. This has included flatscreen tellies, laptops, laser printers, digital cameras etc. Likely some need repairs, but often the kind you can carry out on a kitchen table with basic tools.
Probably best finds have been a 42 inch Panasonic HD TV (can fail to start in very hot weather) and a Lenovo Thinkpad T410s with SSD and touchscreen (lid was hanging off, screen separated from lid, previous owner evidently heavy smoker).
Look out for wheely bins in privately rented blocks of flats and behind offices. Bear in mind that, once in bins, stuff actually belongs to the Council refuse dept. My defense is that I'm making a small contribution to reducing landfill.