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the service is no longer ran as an enterprise service anymore for a number of years.
Although it was normally mixed with an oil train from the same location (which went to Tavistoke Jct Plymouth).
The switch to road is purely down to money and because road is often seen as more reliable and flexible then railways. I suspect (but cant confirm) that the company have gone to road purely for that reason. even if the infrustructor for railways is there for it. by road they know they'll get a close to ontime delivery and not have to worry about line closers as tankers can be re-routed with few restrictions in comparison to railways.
It is true its moving to road, and I've heard theres talks going on for the oil tanks doing the same thing now the train has halved in size. But i can't confirm why that is. In most cases its down to the poor reliablity and costs of UK's railways. (Even if locomotives such as the GM class 66 are more reliable and cleaner then many diesel locomotives before them)...
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