This week's episode is the first of a two-part special looking at the history of rugby union's changing attitude towards head injuries. The sight of Wales' Tomas Francis staggering around Twickenham during February's England-Wales match after a head clash has reignited the debate about rugby's treatment of concussion.

I also have to declare a personal interest as I've done historical research on concussion and rugby for Ryland's Law, the solicitors acting on behalf of the players who are currently taking legal action against the rugby authorities.

For more on the history of rugby and the other football codes, take a look at www.rugbyreloaded.com (where you can find the links for this episode) and follow me on Twitter at @collinstony