Lawyers for a British man who crossed the Torres Strait on a jet ski trying to flee an inevitable jail term in Western Australia for supplying drugs are in talks with prosecutors over his remaining charges.

David James Jackson tried to flee the country on a jet ski. Credit:Nine News

Armed with a crossbow and loaded with supplies for the 140-kilometre journey, 57-year-old David James Jackson took off from the tip of Queensland and made it to Papua New Guinean waters but was nabbed on the eastern side of Saibai Island.

The father of two was extradited to Perth in March and last month sentenced to seven years and five months' jail for possessing a prohibited drug with intent to sell or supply and possessing stolen property.

The charges date back to 2016, when police found 840g of 85 per cent pure methylamphetamine inside a speaker box in his car.