Flying Toblerones, mysterious illnesses and silky-white substances are among hundreds of close encounters described in previously top-secret files released by the Ministry of Defence (MoD). More than 6,000 pages of material spanning from 1994 to 2000 holds hundreds of other-worldly experiences with unidentified flying objects (UFOs) and apparent aliens across Britain. Aircraft of all shapes and sizes have been witnessed flying over a wide range of locations. One man told police he was physically sick and developed a ''skin condition'' after an eerie ''tube of light'' enveloped his car in Ebbw Vale, in Wales, at 10.40pm on January 27 1997. Other highlights include: -- A man arrived at his Birmingham home at 4am on March 20, 1997, to discover an illuminated blue triangle hovering over his garden. The craft shot off leaving behind a ''silky-white'' substance on the tree-tops, which he collected in a jam-jar. -- A UFO sighted by Boston and Skegness police, in Lincolnshire, was captured on film. The police reported the sighting to the coastguard, who in turn alerted ships in North Sea - where a crew saw more UFOs. -- A letter from senior MoD official Ralph Noyes in which he describes seeing a film of UFOs captured by RAF fighter pilots in 1956. Mr Noyes claims the footage was shown at a secret underground screening arranged for Air Defence staff at the MoD Main Building in 1970.