A gentleman who joined us in Jan 2009 as an envoy in

A gentleman who joined us in Jan 2009 as an envoy in Southampton was retained during a redundancy process is September 2012 however the lease ran out on the Southampton premises and was no longer fit for purpose. New premises were purchases in 2012 and most if not all of the staff retained their jobs. We currently have a small issue with one of the envoys who from his home in Southampton to the work location in Hook has to travel 37 aprox miles in total to get to work. Looking through his file he was retained as apart of the redundancy process in 2012. His revised contract states:-
* He is based from home (he collects goods on an afternoon from the Hook branch to take back home with him in the van and then delivers them to customers the next morning on his way back through from Southampton)
We have vans fitted with trackers and reports are showing that 9 times out of 10 he his homes most afternoons by 2.30/3pm. We appreciate that he leaves home at 6.30am approx. each day but he is using this as his start time and reason for getting home when he does. This is not entirely his fault as the Manager really need to address the route plans to make sure the Envoys routes are the most cost effect and efficient for the business. If we wanted to change his place of work back to the branch location am I write in saying that we need to consult with him and provide him with sufficient notice ? i.e. 7 weeks according to his contract