There are a number of clues that prove that this is a wide beam in your picture. Note the pallet laid length ways across the roof.
The standard pallet length is 120cm (48 1/2 inches), The average width of a liverpool narrowboat roof is 146cm (57 1/2 inches)
from handrail to handrail. The gap between the pallet edge and the hand rail is far wider on either side than 26cm (10 1/4 inches)
that would be available on a narrowboat roof in total. Prepack BBQ's also come in standard sizes, as do vending machine cups,
butter packs, drink cans, They can also be used to guage the wi