Sorry, definitely two tubs to a flat!
The GNR carried these tubs two to a flat (with drop sides) specially built for the traffic in 1952. I have a photograph taken in UTA days of a goods with a string of them at the front.
My CIE flat is based on a few photos taken by Joyce Topley, a senior UTA operations manager, who photographed one of these off the tracks in the 1960s! There are clearly two tubs on the lfats involved and there is a little wlakway between them, hence the stretched prototype shown earlier.
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