Dan Richardson scored a 92nd minute winner to secure a fantastic result for Llay over the Saints.
The Welly lost 5-0 at Park Hall back in October, but it was a different story at The Ring on Saturday.
Callum Richardson and first team regular Max Peate (2) also netted for the Wrexham side, Charlie Horton, Ben Connolly and sub Brandon Wust replying for the Salopians.
Hugh Holland, Ben Williams and Jake Jones supplied the goals which won the day for Airbus, Leo Jones on the mark for Ruthin, who had Gruffudd Hughes red-carded on 58 minutes.
James Reynolds (2), Konstantn Kostadinov (pen) and sub Sam Bryan clinched maximum points on the road for Gresford, Reynolds also missing a penalty.
Theo Cole-Jones and Steven Messum-Jones replied for Mold.
Sam Parry (3, 1 pen), sub Max McGoona (2) and captain Nicola Georgiev combined to earn Bay a thumping victory at Cae Marian, Rhys Taylor-Clarke and Jack Thomas for the hosts.
Harvey Bennett grabbed the winner for title-challenging Llandudno.
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