Pakistan offspinner Saeed Ajmal says he's working on a secret delivery to surprise England's batsmen in this month's Test series. Ajmal took 50 wickets in eight Tests last year and often surprises batsmen with a doosra, a ball that drifts away from right-handed batsmen. He did not reveal his newly developed delivery Friday, but said he would definitely try it out against England. “We are working on a special delivery, it's not very far, you will know it,” he said. The three-Test series begins in Dubai, United Arab Emirates on Jan. 17, and Ajmal hopes the pitch will suit spinners. He grabbed eight Sri Lanka wickets in a Test at the same venue in October 2010. The offspinner has not targeted any specific batsmen but has been watching videos of the Englishmen. “We are going (for the series) fully prepared,” he said. “We have special plans and we are working on that.” Ajmal took 12 England wickets at Birmingham, The Oval and Lord's in 2010, including a five-wicket haul in the first Test which Pakistan lost by nine wickets. However, the series was marred by the spot-fixing scandal after which three Pakistan players were jailed. Pakistan has overcome the loss of Salman Butt, Mohammad Asif and Mohammad Amir from the scam over the past 18 months with Ajmal playing key roles in series victories over Zimbabwe, Sri Lanka and Bangladesh. The offspinner, who has 83 wickets from 17 Tests since his 2009 debut, has the ability to keep batsmen guessing with a variety of deliveries and hardly allows batsmen to come out of the crease on flighted deliveries. “If I bowl flighted deliveries, I simply cannot bowl,” Ajmal said. “If I take 90 percent of my wickets while bowling doosras and off breaks, there's no harm in it.” Ajmal is the top bowler in the One-Day International rankings, but did not want to be compared with England offspinner Graeme Swann.