12 inches in a foot 
15 men on a dead man’s chest (yo ho ho and a bottle of rum)
15 Players in a Rugby Union team
25 Years: silver wedding anniversary
50 years: golden wedding anniversary
20: a score
51: fail…
M1EYP: Depends on interpretation of the status of some components I suppose. I’m still happy with this figure.
1000 Metres in a kilometre
198 Radio France Long wave khz (guessing only)
911: emergency number in America
1966: decimal currency introduced in australia. Clue wrong. :). Wrong Currency in England?
53: Herbie’s Number
Yes! Or as one of my kids said (when very young) Herbie Wun Kenobie!
1966: World Cup in England seems to fit, Andrew
I knew it would be some insignificant event like that… Decimal currency was much more important. Even had a (stolen) jingle.
22 Balls on a Snooker Table
23 Pairs of Chromosomes in the Human Body
23: David Beckham’s Number at Real Madrid and LA Galaxy
28 Dominoes in a Set
Ellipsis
M1EYP: ?