Can anyone shed some light on the matter?
"I've just had the charging system repaired and a full service done on the bike, including a new battery.
However, after riding less than 60 km's on the bike it spluttered and died."
Was this the same symptom that led to the charging system being replaced, ie: same problem?
"New charging system" = battery, reg/rec, alternator and new(or cleaned) connector? Are the battery terminal connections clean and tight?
It could also be a component breaking down when hot (eg: the pick-up coil [aka crank position sensor], or an ignition coil). The battery swap might seem to have fixed the problem but in fact the bike had just cooled down.
Still, at 60km (37 miles) the bike ought to be so far into fully-warmed territory I'd suspect the charging system at first, as you have.
When it conks out does it smell of unburnt petrol or not?
Also possibly a fuel feed problem due to a vacuum forming, (pinched or blocked tubes?) but someone else will have to comment on that.