I liked 'the tall one with the stick' or to give him his proper name Nicholas Crane, and to give 'the stick' its proper name, the umbrella attached to the outside of his rucksack. A man carefully crafts his image as an outdoor walker and all he get is to be called the 'tall man with a stick'. I think he wrote and presented the first shows and perhaps the Beeb wanted to continue the series but couldn't get him to write any more. The emphasis was on geography in the early days but has branched out to other specialisms requiring different presentors.
I like 'The Highlander' who is a fairly dour presenter of Scottish history, not afraid to criticise the English.
As for Miranda 'Klashnikof' that is quite funny, but I can't find her real name.
The 'posh comedy one' is Mark Horton a well known archaeologist who has written lots of books. He can afford to laugh at himself.