I recorded a six part series of tutorial videos for YouTube showing all the strats I've found for speedrunning Manic Miner on the ZX Spectrum. Here are the links to each vid:

PART 1: Intro, Central Cavern, Cold Room, Menagerie, Uranium Works

PART 2: Eugene's Lair, Processing Plant, Vat

PART 3: Kong Beast, Amoebatrons, Endorian Forest

PART 4: Mutant Telephones, Kong Beast II, Ore Refinery

PART 5: Skylab Landing Bay, Bank, Sixteenth Cavern

PART 6: Warehouse, Amoebatrons II, Solar Generator, Final Barrier

Or, if you would prefer them all as one playlist: https://www.youtube.com/playlist?list=PLqNObzuH834fdcjL-thLDLMeRaV0FGKs_