L-shaped building with luminus edgesThis was a truely amazing sight. I watched a craft cross the valley below us it passed over a town over our heads and out towards the moors (Dartmoor). The craft was about 120meters long eighty meters high at one end and forty the other and about forty wide. Basically an L-shaped building. Travelling at about 50mph and at a height of about 50feet. Every straight edge was as a flourescent tube. Underneath were three white lights joined by huge pipes. At the rear of the craft there were two wing like structures which seemed to be emmiting a blue/purple light this appeared to be propelling it along in a Northerly direction. The craft emmitted a low electrical humming noise as it passed overhead - similar to a sunbed or electro magnet((NUFORC Note: Witness indicates that date is approximate. PD))