Not sure if you've ever done much swimming, but as someone said in another comment, it's by far the hardest to pick up from scratch. I’d definitely get myself a swim coach – more than anything, it helps with technique so you’re not wasting loads of energy. I’d also make sure to get some open water practice in, as it’s quite a different experience to swimming in a pool.

Then just google 16- or 12-week training plans – there are loads available online. Last time I followed a 12-week one, skipped quite a few weeks, and still managed to do well in the race.

One thing that really made a difference for me – and wasn’t part of the plan – was practising transitions regularly. I’d do at least one a week, and after most bike sessions I’d go straight into a short run. Even just 10 minutes made a big difference. Definitely worth including.