Thanks Gibbo for the quick reply - much appreciated & much as I suspected - I realise there's no gurantee and you obviously can't open all the stock (lol).
You've 'sold' me to chance my arm and place my order (with a few other bits too

) - I'm betting that the 'stock batch' you have should all have the same mem, but I'll only know when it's delivered.
Cheers Gibbo - you made a sale!