Tom Varndell helped himself to a hat-trick against London Welsh as Wasps won away from home in the Aviva Premiership for the first time in 2015 to keep their top-six hopes alive. Ahead of the trip to the Kassam Stadium, Wasps' hunt for an automatic European Rugby Champions Cup spot next season had stuttered after winning just one of their previous five fixtures in all competitions. However, they claimed a 40-13 win over Welsh with tries from Varndell, Ashley Johnson, Sailosi Tagicakibau and Alapati Leiua . Tom Varndell crosses for one of his three tries as Wasps ran out comfortable winners at the Kassam Stadium . It was far from plain sailing for Wasps, though as the Exiles, whose defeat to Bath last time out confirmed that they will finish bottom of the table, trailed 12-5 at half-time after Opeti Fonua bundled over after the first two of Varndell's tries. But Johnson dotted down and Varndell added his third before Tagicakibau secured the bonus point for Wasps, with Alapati Leiua getting in on the act with the last play of the game. Chris Elder scored Welsh's second try of the match in the second period. Wasps got off to a fast start at the Kassam as they went 12 points clear after as many minutes. The visitors found the tryline after only four minutes as Varndell broke down the right flank and scored in the corner, veteran fly-half Andy Goode converting well from a tight angle. Welsh then went down to 14 men eight minutes later when Koree Britton was sent to the sin bin for pulling down a maul and Wasps instantly capitalised as Varndell grabbed his second try. Seb Stegmann is tackled by Carlo Festuccia as the exiles put up a fight, but faded away again . Alapati Leiua breaks away to score a late try as Wasps pulled away in the closing stages . The Exiles crept back into the game, though, keeping the pressure on Wasps' defence and Fonua forced his way through to make it 12-5, Tristan Roberts kicking the conversion side. Welsh started the second half well and Roberts made amends for his earlier miss as he calmly kicked a penalty between the posts to reduce the arrears even further. But Wasps soon began to dominate and a lineout close to the try-line was bundled over by Johnson in his first start as hooker. Then a swift break down the right saw Varndell free to run back around the Welsh defence and score under the posts for his hat-trick. Elder scored a try out of nowhere four minutes later for the Exiles on his Aviva Premiership debut, as he found space on the left wing to touch down in the corner. Wasps instantly replied though as Tagicakibau finished a great run through the centre by reaching for the line. And the game ended on a high for Wasps as Leiua finished the scoring with a darting run through the middle. James Cannon wins a line-out for Wasps ahead of London Welsh's Matt Corker as Wasps recovered their form . Andy Goode adds extras as Wasps renewed their chase for a European Champions Cup place .
Tom Varndell scores three as Wasps pull away at the Kassam Stadium .
London Welsh put up a brave fight but fall away late in the game .
Ashley Johnson, Sailosi Tagicakibau and Alapati Leiua all score tries .