Senior figures from Libya's self-proclaimed government in Tripoli have said they will "co-operate" with any new investigation into the Lockerbie bombing.

Two prisoners, Mohammed Abouajela Masud and Abdullah al-Senussi, have been named as potential new suspects.

But the case poses a difficult question for British and American authorities - whether to work with a government it has refused to recognise as the legitimate one - or to wait for peace in a still unstable country.

World Affairs Editor John Simpson reports from Tripoli.