This was their ninth consecutive County win, and maintains their unbeaten record so far this year.
It also underlined their superiority against the Sarnians – who moved down from Division I at the start of the season and whom they also beat – for the first time in 27 years – earlier this year in the annual Gilson Cup encounter.
Team manager Mark Constable, who recently arrived to live in Jersey, said: ‘It was good to beat them.
We thought we could win, and what it comes down to is that we have a better team.
Their men are strong but we can equal them, and our ladies are much more experienced than theirs, though we hadn’t expected to win by such a good margin.
If we keep playing like this we hope to go up a division next year.’ He added that he has been made well aware of the importance that Jersey sportspeople attach to any encounter with Guernsey.
Constable, the Jersey No 1 who is a former England National singles champion, beat Guernsey’s top man, Darren Le Tissier, 15-2, 15-2.
Le Tissier, a former Commonwealth Games competitor who also has numerous Island Games titles under his belt, simply had nothing in his repertoire to trouble his opponent.
Jersey’s No 1 lady, Kerry Coombs-Goodfellow, maintained her record for Jersey at County level by giving her opponent, Vicky Naylor, an 11-2, 11-0 drubbing.
The closest singles match was between Jersey’s Chris Guillochon, making his début, and Quentin Petit.
Guillochon narrowly lost, 4-15, 15-6, 13-15 after taking a 7-0 lead in the third set, but Kim Ashton, Jersey’s No 2 lady, produced a straight sets 11-4, 11-6 win against Rachel Legg.
Jersey took that 3-1 lead to a 6-2 advantage in the doubles, Constable and Melbourne-bound Clive Dunford beating Le Tissier and Petit 15-7, 15-8; veterans Anton Kriel and Ian Coombs-Goodfellow disposing of Kevin Le Moigne and Chris Dragun 15-6, 15-5; and the ladies pairing of Coombs-Goodfellow and Lucy Burns too strong for Legg and Naylor, winning 15-4, 15-1.
Guernsey’s only win in the ladies doubles came from Sarah Garbutt and Lisa Hayward, who beat Ashton and Tracey Hudson in a marathon game that finally finished 12-15, 15-13, 15-7.
Jersey required two more wins for overall victory, and four for maximum points.
The campaign continued, Constable and Dunford beating Le Moigne and Dragun 15-7, 15-10; Coombs-Goodfellow and Burns beating Hayward and Garbutt 15-1, 15-7 and Ashton and Hudson beating Legg and Naylor 15-8, 15-7.
In the final men’s doubles match Kriel aggravated a back injury and although he continued playing, his movements were restricted and he and partner Coombs-Goodfellow lost 15-5, 15-13, to Le Tissier and Petit – the more galling because the home pair had beaten the same two in straight sets last week, in the Jersey Open.
The injury forced Kriel to pull out of the mixed doubles, but Jersey went on to win all three matches without dropping a set, Constable and Burns beating Petit and Hayward 15-9, 15-3; Ian Coombs-Goodfellow coming in to replace Kriel to partner wife Kerry and beat Dragun and Garbutt 15-6, 15-9 and Dunford and Ashton beating Le Moigne and Naylor 15-3, 15-4.
