Me:    my bike rack's come adrift,  a couple of bolts have come out and the whole lot's dropped down. Do you have bolts for it, please?

50+ year-old cycle shop owner, independent trader - been there for years:    what size?

Me:    standard?

50+ year-old cycle shop owner, independent trader - been there for years:    nothing is standard with cycles.

Me:    what size are the bolts, usually?

50+ year-old cycle shop owner, independent trader - been there for years:   you tell me, it's your bike.

Me:    'scuse me.

50+ year-old cycle shop owner, independent trader - been there for years:    yes.

Me:    where's the nearest Halfords?