HMLS Britannia fought at Arras. Its commander was a Richard Haigh at that time in B company. Haigh later commanded a tank in D battalion at Ypres (possibly D1) where he was wounded and he won the Military cross but in which tank I don't know. He later commanded another Britannia (probably named after the original) on the tour in North America. The original Britannia was presumably a Mk I or II whilst Haigh's tank at Ypres would have been a Mk IV. Does anyone have any further info on either of these two tanks?
Haigh was origianally the company 2IC and went froward to recce the Bullecourt area for the first battle; he took no part in the action itself although Watson asknowledged Haigh's extremely through prepartory work including marking out the forming up positions line. He then was replaced as 2IC and commanded the section which fought at Crossilles in May 1917.
All this info extract from Watson's "A company of tanks"; Haigh own version of events in "Life in a tank" is more confused and,whilst somd tallies, other elements do not. However, at no time does he claim to have commanded a tank,
As mentioned in another post, there is a film clip on an Australian memorial site showing Britannia in action shortly after some action "herding prisoners" according to the title (8 August 1918, Battle of Amiens).