Tui recently made a fresh play for third-party agents’ support with a new “give us a go” trade message – so has Marella benefited from its parent operator’s endeavours? Managing director Chris Hackney is unequivocal; this year has been the best in the line’s 28-year history, one in which it carried more than 350,000 passengers and worked with nearly 200 new agents. Things are going so well, in fact, that Marella felt confident enough to increase its Atol in September by around 15% from 355,521 authorisations to 409,852 – putting it…