Just decided to try the console out, as if it didn't work i'd have to get a replacement at a car boot sale.
Booted the PS2 up, got the configuration screen ok, but the disc didn't read. Tried another disc, same thing. Typical I thought, seller at car boot sale sold it knowing it didn't work, rats!
Nothing to lose, so took my usual cavalier attitude to modding (BTW, the definition of "cavalier attitude" is "Carefree and nonchalant; jaunty"), opened up the PS2 and also the disc drive. Used a soft cloth on the laser unit, gave the whole area a good spray with compressed air in case any old dust was clogging up something; tried again, nothing.
I then noticed something - the black surround on the motor unit where the disc rests on, was raised in parts and not in others, looked closer, the plastic surround was raised; so pressed it down, and it was flat and even. Turned the system on and voila! Worked! So, i've got a working PS2 console for £5. I reckon the seller at some point dropped the console and thought it was dead.

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