I've mentioned him at least once before, but he deserves another burst of praise. Tony Robinson, perhaps still best known as Baldrick. This guy, in case you still can't remember:
A series of his Walking Through History is on SBS again, and recently they ran his three part "Wild West" show. (Did I mention it before?) All great to watch, as was his WW1 series a year or two back.
The simple message is - he just makes terrific and engaging shows on history. If you see any history show hosted by him, you should watch it.