Bookended by two experienced competitors, with debutantes in the middle, they went seventh quickest in the heats with a 3min. 55.88sec. clocking at Tollcross International.
A clean sweep of sub-1min. legs ensured they smashed the previous Guernsey mark of 3-59.17 from Birmingham 2022.
Tatiana Tostevin started them off with a 59.16, backed up by Tallulah-Mae Rautenbach’s 58.81 and Emma Bourgaize’s 59.67.
Anchorwoman Orla Rabey brought them home with a leading split of 58.24.
They qualified by virtue of being among the eight fastest teams, beating the Cayman Islands (3-58.11) and the Isle of Man (4-01.51), with Canada not starting.
‘I was pretty confident we could break that record, knowing the form the four swimmers were in,’ coach Sara Parfit said.
‘I was surprised to see how much we broke it by.
‘That was so exciting – they did an amazing job.
‘I would like to hope they might break the record again tonight, with the excitement of the finals and a full stadium, with the crowd roaring.’
The men’s quartet of Charlie-Joe Hallett, Zach Maiden, Henry Bolton and Ronny Hallett – the middle two also debutants – posted 3-39.34 for 13th quickest overall.
Both Charlie-Joe Hallett and Henry Bolton went under 54sec. for their legs.
Other highlights of the opening swim session included Orla Rabey just missing out on her Guernsey 50m butterfly record with a 28.39 – 0.02sec. shy of her previous mark.
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