There is a varying selection of LEDs in the carousel and above the soldering bench.

There is a motley assortment of small signal diodes in the carousel.

Power diodes can be found in the carousel and a crate on the electronic shelves. They include

• 1N4004, 1A 400Vpeak for general purpose use including mains rectifiers, catch/snubber diodes around solenoids
• 1N4007 a 1000Vpeak version of the 1N4004
• bridge rectifiers
• 1N5401 3A 100Vpeak diodes

I don't remember seeing any selenium recifiers around; perhaps that's just as well!