I had two boys who said they’d thought of every way of getting out of doing this, but they volunteered for every race. One swum 10 metres unaided! He didn’t – and we didn’t – know he could do it.

I had two boys who said they’d thought of every way of getting out of doing this, but they volunteered for every race. One swum 10 metres unaided! He didn’t – and we didn’t – know he could do it.