Crawford v. Network Rail Infrastructure Ltd  UKEAT 0316/16
Compensatory rest under WTR- the length of the individual break is crucial
In this case Mr Crawford was a railway signalman working on single manned boxes on eight-hour shifts. He had no rostered breaks but was expected to take breaks when there were naturally occurring breaks in work whilst remaining ‘on call’. Although none of the individual breaks lasted 20 minutes, in aggregate they lasted substantially more than 20 minutes.