Weather permitting, the 45-year-old could be one of the earliest to complete the feat this year as the Jersey woman is among the first batch of swimmers due to set off from Dover’s Shakespeare beach between 22 and 30 June.
Tréhiou is not the only Jersey swimmer looking to cross the world’s busiest shipping lane this year, as Jersey Long Distance Swimming Club president Sally Minty-Gravett, who has completed one-way Channel crossings in five different decades, will attempt a two-way crossing and Islander Andy Truscott will also make a single crossing attempt in September.
Tréhiou said: ‘As usual there are lots of swims planned in the coming months and everyone involved has been training hard over the winter.
‘I’m also hoping to become the first solo swimmer to swim from St Malo to Jersey in August; I’ve done it before as part of a relay team but it’s never been done by one person on their own.
‘It’s certainly a challenging and difficult swim because of the big tidal range, especially with the Minquiers in the middle.
Tréhiou, who became the first Channel Islander to swim across the English Channel and back, in 39 hours and nine minutes in August 2013, also completed Channel crossings in 2006 and 2012.
The vice-president of the Jersey Amateur Swimming Association said training had gone well and her only worry at the moment is the water temperature.
The risk manager at HSBC, who overcame breast cancer diagnosed in 2011, said: ‘It’s 14 degrees here in Jersey at the moment but in the Channel it’s only 12½, so it is cold. I like to swim with the sun on my back, so hopefully it will warm up a bit and it will be sunny.’
Training has included indoor swimming up to 10,000 metres up to the end of April and up to six hours in the sea on a Saturday and four hours on a Sunday of late.
Training in Spain last month also included a ten-hour sea swim.
Tréhiou, who will be raising funds for Macmillan Cancer Support, Alzheimer’s Jersey and Southampton Hospital, added: ‘My pool training went really well and everything since has gone as well as expected. I’m happy with my sea swims and my only worry is that’s its still pretty chilly in the water in the Channel at the moment.’
