there is 80mm space behind units,
i got my units from wickes
the reason for this is the plinths were only 4inches.
everywhere else were 10 inches.
i saw that as a waste of 6 inches of usable space.
all pipes are going directly below,
from the top of worktop to back of unit is 280mm.the sink sits 200mm below.
so i am looking for a waste that will take me back to the wall within 80mm,
if this makes any sense
cheers john