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This titles grab is from the 25th Anniversary edition of Gardeners’ World. The special programme went out on 4th August 1994. The programme was produced by Keith Hayley, and exec produced by John King. It was presented by Geoff Hamilton. This was during the ten year period where Gardeners’ World was made by the independent production company: Catalyst, but it looks like this show was made in-house by BBC Pebble Mill.
Here is the link to the Radio Times listing for the show: http://genome.ch.bbc.co.uk/69dd0c60a4194396bc6f549e1d26aa5f.
Thanks to Ian Collins for making the still available.