Sometimes an event comes along that just entirely captivates. In the case of the Swim4Leukaemia charity relay back in 2014, there was an added personal dimension and the sense of a higher purpose that also added additional meaning. So while it delivered on a purely swimming level with a world record for a 100x100m relay, it also delivered emotionally; as I wrote at the time, Sheffield , the steel city, had also shown itself to have a heart of gold.

I spoke to the man behind the event, Lewis Coleman, about the motivation he drew from his mother’s cancer diagnosis and the challenges of pulling off a world record feat. You can watch the story in the video below and get the full lowdown on a memorable day in the accompanying podcast.

Meanwhile, to hear more from the swimmers who took part, have a listen to the original podcast from 2014 which followed events as they took place. Finally, the event was recorded for posterity by photographer Simon Wright of GBSwimstars – his photos captured the event perfectly as the slideshow below demonstrates.

To support research into blood cancer treatment you can donate to Blood Cancer UK.