Hi Lighterman, yes the MoD barges, where shaped like that concrete one, but had more rounded runs, there where two types of store lighters, the 250t size with a small deckhouse one end, the deckhouse was a combination of a w/c and a companionway to the living accom, the other was 100t size which had no crew accom. When fully loaded and deep, they where not so good as a Thames lighter to tow. The 250t ones where all numbered 11-- and the 100t were numbered from 1000 upwards.