Can they sack him?

buck73:
we are getting a bollocking off our lot at the minute for “overspeeding”.im in the same position as coddy,whereby my truck is set at 52 mph,and if it goes to 53,54,55,etc it registers an overspeed.whilst i know that the motorway regulations are 60mph for a hgv could someone in the know (possibly vosa) please keep me right on the following points:
1)can vosa tell on a digi tacho that you have overspeeded the set limit,but NOT exceeded 60 mph?.

yes

buck73:
2)is overspeed up to but not over 60 mph an offence?.

no

buck73:
3)is overspeed a separeate offence to breaking the speed limit?.

its not an ‘offence’ its an ‘infringement’. You have ‘infringed’ the vehicles set speed.

buck73:
clarification would be greatly appreciated.

And to answer the OP’s question, yes they can sack you if you persistently exceed the vehicles set limit when you have been told not to. It’s gross misconduct.