By Mark O’Brien & Tim Hanlon A multi-million pound private jet with the call sign ‘Mr Big’ has touched down in Dublin sparking plenty of curiosity. Theplane, an expensive Lear Jet costing about £11.7 million, caught attention as it flew to Dublin Airport from London Southend. And it appears as though the ‘Mr Big’ aircraft has been very active recently. The plane flew to Southend from Chambery on Thursday having arrived at the French airport on Monday. And last Sunday it had flown to Chambery from Bristol. The curious call sign certainly perked people’s interest when it appeared on the Flightra…