Prebble is one of the best historians on Scottish history from the mid-20th century. He was born in Middlesex, but he lived in Canada and fell in love with Scotland.
His books are very well written, as he was somewhat of a wordsmith, a rarity for most historians!

It might be true that some of his single books devoted time to some topics that were often overlooked or even downplayed to some degree. Glencoe, an important book, took on the issue of a massacre of a Highland Clan at the hands of Scottish military company on direct orders from government officials and the King himself, although that would be hard to prove. It's importance lies in the conspiracy to "root out that damnable sect of theives" as Master of Stair put it, and what role officials had in it.
Darien is about the disasterous events of an expedition to Panama for a Scottish trading company to compete with the English East India Trading co. It's a sad read. One wonders why the English didn't come to the rescue of the troubled expedition (disease, attacks from natives and Spanish) since by this time Scotland was under the same Crown? I know the answer they give, it still has holes in it.
Prebbles other single works are Culloden and Mutiny which is about a Highland Regiment. But less known are his complete histories of Scotland such as "Lion in the North" which covers most major Scottish history events in a 1,000 year span, although his coverage of early Scotland is weak.
Overall, I think he's one of the best. Fun to read and very informative.