Not for nothing are the two ‘locks’ known as the engine room – it is they who provide the power in the scrum. The No 4 is typically shorter and bulkier, and pushes behind the tighthead; you will jump at the front of the line out and must be dynamic to react to a fast throw. In contrast, the No 5 will be a middle-of-the-lineout skyscraper able to win a stream of ball – and the same is required at restarts. Far from just being a big lump, a second-row should be a clever clogs able to read the opposition or deceive them. And vertigo sufferers need not apply because you can be 13 feet off the ground when gathering in those lineout throws!

John Eales of Australia

Major teams: Brothers, Queensland Country: Australia
 Test span: 1991-2001 Test caps: 86 (86 starts) Test points: 173 (2T, 31C, 34P) His famous nickname Nobody, as in ‘nobody’s perfect’, is a…

Scotland's Gordon Brown

Major teams: West of Scotland     Country: Scotland Test span: 1969-77 Scotland caps: 30 (28 starts) Lions caps: 8 (8 starts) Test points: 8 (2T) And there were few personalities…

Major teams: Blue Bulls, Griquas, Cats, Toulon, Northampton Country: South Africa
 Test span: 2001-2015 South Africa caps: 127 (121 starts) Test points: 35 (7T) Not even retirement halted Victor Matfield’s…