I remember my dad buying a box of used game cassettes for the Spectrum for me back in the mid to late 80's. Amongst them was Elite, but on loading found it required a lenslok and there wasn't one in the case.
Now, I already had one of these things for Tomahawk (an Apache helicopter simulator). Sadly I couldn't get it to work, despite trying a number of times. Guess they must of had different lenses.
Mind you, I couldn't get it to work half the time with the correct game. Hateful thing.
Didn't get to experience Elite for a few more years until Elite+ on the 386.