By Nicola Fahey Lord Alan Sugar is poised to sign a six-figure contract to remain the star of The Apprentice until 2026. The huge deal would mark a momentous 20th series for the business magnate, who has been sinking the hopes of dozens of wannabe tycoons with the dreaded words “You’re fired!” since 2005. TV execs are already on the lookout for fresh recruits for a special anniversary series. A source said: “ BBC producers have huge plans for The Apprentice’s 20th anniversary. It might be two years away but they’re aren’t prepared to take any risks and will be putting in a big-money offer he c…