As soon as the FCO decision was made public, travel agencies like Thomas Cook flew British tourists to Tunisian holiday resorts.
Other British travel agencies are also resuming their Tunisian holiday packages like TUI which will relaunch its flight to Tunisia in May 2018.
But, after the FCO eased its travel advice, tour operator Thomas Cook resumed flights to the north African country for United Kingdom customers.
Having "carefully reviewed conditions" in the country - including the threat from terrorism and improvements in the Tunisian security forces - the Government changed its travel advice in August past year.
Travellers left Birmingham Airport on a Thomas Cook flight to Enfidha shortly after 6am this morning, on the first package tour to Tunisia since the Government eased its travel advice.
A seven-night Easter holiday at a Thomas Cook hotel in Tunisia costs about £2,000, compared with £3,000 in Gran Canaria.
Government travel advice reads: "Since the terrorist attack in Sousse in June 2015, which targeted tourists, the United Kingdom government has been working closely with the Tunisian authorities to investigate the attack and the wider threat from terrorist groups".
"Tunisia is once again proving to be a popular choice for a value for money holiday".
The FCO advises against all travel to parts of south Tunisia on the Libyan border as well as parts of west Tunisia.
The Foreign and Commonwealth Office advised against all but essential visits to Tunisia following the attacks.
The Islamic State terror group said it was behind Rezgui's massacre.