You might find you need to buy a multi-pack of 16 billion fixings just to get the one M6 you actually need :(
B&Q/Wilko do a pick 'n' mix thing with screws and fixings, which is actually really useful if you know what you need. I forget if nuts/bolts are part of the deal, though.
@Tonts started
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You might find you need to buy a multi-pack of 16 billion fixings just to get the one M6 you actually need :(