Muammar Gaddafi:

Following his ascension to power, Gaddafi moved into the Bab al-Azizia barracks, a six-mile long fortified compound located two miles from the center of Tripoli. His home and office at Azizia was a bunker designed by West German engineers, while the rest of his family lived in a large two-story building. Within the compound were also two tennis courts, a soccer field, several gardens, camels, and a Bedouin tent in which he entertained guests. In the 1980s, his lifestyle was considered modest in comparison to those of many other Arab leaders. Gaddafi allegedly worked for years with Swiss banks to launder international banking transactions. In November 2011, The Sunday Times identified property worth £1 billion in the UK that Gaddafi allegedly owned. Gaddafi had an Airbus A340 private jet, which he bought from Prince Al-Waleed bin Talal of Saudi Arabia for $120 million in 2003. Operated by Tripoli-based Afriqiyah Airways and decorated externally in their colours, it had various luxuries including a jacuzzi.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What was the value of Gaddafi's supposed British property holdings as of November 2011?
£1 billion