Unfortunately there was only one video ever released of Harry which was from the My Name Is Harry Worth Series. It was released by Thames TV but alas is now obsolete. Copies are sometimes sold on ebay.
There were 2 episodes on it

There's No Place Like It and
The Reference

Harry was cast as a bumbling brush salesman lodging with Mrs Maybury ( Lally Bowers ) with occasional visits from her brother George ( Reginald Marsh ).
Cast
Harry Worth - Harry Worth
Lally Bowers - Mrs Maybury
Reginald Marsh - George Bailey
Crew
Ronnie Taylor - Writer (4)
George Layton - Writer (3)
Jonathan Lynn - Writer (3)
Spike Mullins - Writer (1)
Peter Robinson - Writer (1)
William G Stewart - Director / Producer

Transmission Details
Number of episodes: 8 Length: 30 mins
22 Apr-17 June 1974, Mon 8pm