I've looked everywhere. I suspect that since this work was done before we started using the internet for this sort of thing (storing music scores online), no one ever got around to it, the principals having gone on to something else.
There were a number of performance decisions1 that I would dearly love to know Adrian Shepherd's thinking.
Karl
1. The performance in question: Thomas Augustine Arne Symphonie 1 - 4, LP later a CD on Chandos.