I have just put on my shoes and gone down to the shed to see how I unclip the pedals.
Shimano A520 and M520 pedals. I unclip by swinging the heel inwards. The only pedal I could not unclip this way are a set of SPD Compatables that came with the Bianchi MTB in 2000. They look like Shimano except that they are Celeste coloured- They work by pulling up and heels out. Heels in and I was hitting the wheel just as they unclipped
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How long was I in the army? Five foot seven.
Spike Milligan