Peter Underwood on 'No.73' talking ghosts (1982) 

Resurfaced recently thanks to Scarred for Life (@ste1bro), who said:
"In 1982, the brilliant Saturday morning kids' show No. 73 hosted legendary (and extremely charming) ghost hunter Peter Underwood. Here he is, telling the young audience that ghosts unequivocally exist, like a walking talking Usborne Book of Ghosts."
At the end of this sequence he presents A Ghost Hunter's Handbook (1980), aimed at a younger audience, which inspired the exhaustively serious book, The Ghost Hunter's Guide (1986).