 Complete the following phrase:  In Aden in 1966 a unit of the pioneers carried out a speed demonstration in which they erected a Twynham hut in four minutes. The huts could be readily dismantled and reused elsewhere as was done later in 1966 and 1967 when the British withdrew from the country. Lieutet-colonel Gus Sinclair recovered 85 Twynham huts from an abandoned British base in the aftermath of the 