By Guy Taylor Gatwick’s chief executive is spearheading a drive into the long-haul market as the UK’s second biggest hub seeks to muscle in on its larger rival Heathrow. Referring to the Sussex hub’s growing route offerings, Stewart Wingate said “the proof of the pudding is in the eating… You can see us developing our long haul network, which is really substantial and growing.” Wingate pointed to a string of recent deals with airlines including India’s flag carrier Air India, Saudia, Air Mauritius and three major Chinese carriers. “Certainly, as we look to the future, one of the areas that’s i…