Moores Bros KGT378, a Guy Arab III with Strachan C35F body, new to London based Dartmouth Coaches in 1950 and acquired by Moores in 1953.
The four vehicles in this batch passed to Eastern National in February 1963, KGT378 gaining the fleet number 030 which can be seen in this picture - they only lasted briefly in the ENOC fleet, being withdrawn later that year on October 1st.

Photo from Essex Bus Enthusiasts Group collection, courtesy Chris Stewart, taken Feb/Mar 1963, Kelvedon