Came across this: http://www.airliners.net/aviation-fo...ain?id=2991558

Another mystery (to me at least) that someone may be able to help with concerns all 17 of BA's 744s delivered after 1 January 1998 (G-CIVP to 'VZ and G-BYGA to 'GG). Each of these aircraft was ferried from Boeing at PAE straight to Marshall Aerospace at CBG for 'cabin modification'. What was this modification? Why was it not eventually incorporated in Boeing's cabin fitting of the new aircraft? (The modification programme lasted almost 18 months. It was not completed until the end of May 1999 when the last 744, G-BYGG, was ferried from CBG to LGW to be put into service for the first time.)

And purely because it was our very own Prospero... (I know hillrider has already answered anyway) http://www.flyertalk.com/forum/archi...33240-p-2.html

Four Boeing 747-436's were delivered as 'lites' with a reduced take off weight, a deactivated stabiliser fuel tank and with fewer crew rest and galley facilities. G-CIVF/G/H/I were designed to be flown on sectors which do not need the full range capability of a standard 744 and as they operate at lower weights, incur lower landing fees. They were later modified to include crew rest facilities fitted to restore some of their long range capabilities.