Adel Yahya, a British national from the Tottenham area of north London, is due to appear before Bow Street Magistrates’ Court, central London, on Friday morning.
Yahya was arrested Tuesday at London’s Gatwick airport after arriving there on a plane from the Ethiopian capital, police said, adding that they believed he had been out of Britain since June.
He was the 43rd person arrested in connection with the failed attempt on July 21 to murder passengers on three London Underground trains and a double-decker bus.
The alleged plot came just two weeks after four presumed Islamic militant suicide bombers blew themselves up using explosives in rucksacks, killing 52 passengers on three subway trains and a bus on July 7.
The July 7 attacks, which coincided with a summit involving leaders of the Group of Eight richest nations in Scotland and a day after London secured the 2012 Olympic Games, were the worst terrorist attacks on British soil.
The trial of five other men accused of conspiring to murder passengers on July 21 has been provisionally set for September 2006.
They have been named as Muktar Said Ibrahim, 27, from Stoke Newington, north London; Ramzi Mohamed, 23, of North Kensington, west London; Yassin Omar, 24, of New Southgate, north London; and Manfo Kwaku Asiedu, 24, of Finsbury Park, north London.
A fifth man, Hussein Osman, 27, was extradited from Italy in September.
At their last appearance at England’s Central Criminal Court at the Old Bailey, central London, judge Alexander Butterfield indicated their trial could last up to two months.
None of the men, who have been held in custody since August, has yet entered pleas.
The charge against Yahya was that he conspired with Osman, Said, Asiedu and Omar “to cause by an explosive substance, explosions of a nature likely to endanger life or cause serious injury to property.”
Four of the five set for trial in September have been charged with attempted murder directed at London public transport passengers, while the fifth is accused along with the others of conspiracy to murder.
Ten other people face lesser charges in connection with the July 21 case, including allegations that they failed to disclose information about suspects or their whereabouts. Their trials are due early in 2007.