Wasps recorded their first Premiership win on the road in more than a year as they ran in four second-half tries to sink London Welsh.

Gordon Ross kicked four penalties for the hosts before the break, with Nick Robinson responding twice.

Joe Simpson's 49th-minute try got Wasps' spectacular comeback under way.

Scores by Elliot Daly and Will Taylor ensured Welsh would take nothing from the game before Tom Varndell's extra-time try gave Wasps the bonus point.

Wasps' last away win in the league came back in October 2011 in a wretched season that only just saw them escape relegation from the top flight.

But their five-point win takes them to 33 points for the season and equals their total points haul from last term - a mark of their progress since September.

LINE-UPS

London Welsh: Arscott; Caprice, Jewell, Parker, Scott; Ross, Lewis; Montanella, Briggs, Tideswell, Mills (capt), Kulemin, Jackson, Denbee, To'oala.

Replacements: Evans, Bristow, Bateman, Corker, Balding, Runciman, Davies, J Lewis.

Wasps: Southwell (capt); Daly, Masi, Bell, Varndell; Robinson, Simpson; Taulafo, Rhys Thomas, Swainston, Launchbury, Cannon, Johnson, Poff, Vunipola.

Replacements: Lindsay, Payne, Taylor, Wentzel, Sa Jones, Davies, St Jones, Mayor.