Wasps: (29) 37 Tries: Erinle, Voyce 3, Staunton Cons: Van Gisbergen 3 Pens: Van Gisbergen 2 London Irish: (29) 56 Tries: Feaunati, Ojo 2, Flutey 2, Tagicabau, Casey, Catt, Armitage Cons: Catt 4 Pen: Flutey

Wasps led 19-10 after five tries in 12 minutes, but Irish scored three in a row to lead 29-19 before Tom Voyce's second try made it 29-29 at half-time.

His hat-trick score put Wasps in front but Mike Catt and an interception try from Delon Armitage put Irish 43-34 up.

Late tries from Topsy Ojo and Rikki Flutey sealed a remarkable victory.

It leaves Wasps, who have slipped to fourth place, facing a hazardous trip to Gloucester, two points behind them, in their final match next Saturday, needing to win to ensure they qualify for the play-off semi-finals.

But Irish, who leapfrog Wasps into third, secured their own top-four spot and entertain Saracens next week with a home semi-final at stake after ending Wasps' 20-match unbeaten home record stretching back to January 1995.

There was barely a minute on the clock when Dominic Feau'nati, switched to centre, powered over for the first of nine first-half tries.

But Ayoola Erinle - profiting from the first of several inspired Stuart Abbott interventions - and Voyce's opener swiftly made it 12-5 before Ojo grabbed a second for Irish.

Jeremy Staunton then danced past Armitage's weak tackle, Mark van Gisbergen's conversion making it 19-10 after just 12 minutes.

But fly-half Flutey, wing Sailosi Tagicakibau - from a sublime Catt pass - and lock Bob Casey all crossed in a nine-minute spell, Catt adding two conversions for a 29-19 lead.

But Irish lost hooker David Paice to the sin-bin, and Wasps profited to the tune of 15 points in his absence, either side of the interval.

Van Gisbergen landed a penalty and converted a Voyce interception score before the England wing grabbed his third on the resumption to put Wasps 34-29 ahead.

But Catt stretched his creaking limbs to collect Flutey's chip, and another interception try for Armitage put them in command with half an hour left.

Van Gisbergen landed a penalty to bring Wasps back to six points, but Irish refused to be bowed and Flutey's superb penalty with three minutes left took them clear before Ojo and Flutey crowned a stunning win.