According to Johnston Press: It’s the first time the business has achieved this standard.
Group health & safety manager Duncan Chappell said he believed the improvement was down to each and every person within the business.
He said: "It has come about through everyone’s hard work and dedication and I’d like to thank everyone for their efforts."
The last lost time accidents to be reported were in January 2012 when six accidents accounted for 35 lost working days. Five years ago, in 2007, there were 38 lost time accidents accounting for 718 lost working days.