The Gambia is a populer holiday destination for people from the UK, it was a British colony the people speak english its also sunny in november compared to britains gloom it is hot and cheap.
oh and so are the locals

from pats link
The purpose of the trip, they have said, was to help Rawi's brother, Wahab, set up a peanut-oil processing plant
On Oct. 31, 2002, as Banna was packing for the trip, an M15 agent called at his London home and pressed him again to infiltrate extremist circles on behalf of British intelligence, either domestically or in a Muslim country.
"He did not give any hint of willingness to cooperate with us," the unnamed MI5 agent wrote in a report.
Rawi told his lawyer he was visited in Guantanamo at least six times by MI5 officials, including some of the same agents who had served as his handlers in London. They apologized for the turn of events, but asked whether he would still be willing to work for the agency if they could secure his release.
They were also accused of carrying a suspicious electronic device in their luggage to Gambia; British police who stopped them at Gatwick determined it was a battery charger, police reports show.
I wonder if MI5 offered them a free rucksack and a return train trip to visit london?