Diners Club, the charge card provider, has become the latest company to join the GTMC as an industry partner.
The company has been involved in business travel for 30 years, since launching the Lodge Account for the UK corporate travel industry.
GTMC chairman Paul Allan said: "The GTMC values its relationships with industry partners and we are pleased to welcome Diners Club to our organisation.
"As a world leader in the sector, we look forward to working with the team to offer valuable industry insight and expertise for all our TMC members."
