Pontoon bridge near Gennep, Holland
The Pontoon Bailey Bridge photograph above is the first of two that I've scanned from negatives. The index suggests it is over a canal near Gennep in Holland
Derbyshire Bridge
Derbyshire Bridge - Location Unknown
At first I thought this was the same location as the one above, but on further inspection this is not the same bridge.
The sign 'Derbyshire Bridge' might suggest a regiment.
Other examples of Pontoon Bailey Bridges
This link to York and York II bridges over the Caen Canal and River Orne shows similar bridges and a Google search finds more, but not apparently the ones I found in my father's collection of photographs