It was funny in parts, but other than that it was a poor effort. Having read about it weeks ago when TG was looking for a huge garden as regards Sports Relief, I thought this could have been funny throughout but it just isn't and falls flat.
Clarkson & May at the garden centre was not only boring but being very obvious about the scripted nature, I found it to be boring and predictable. The water feature was obviously going to fail and again predictable, to be honest, I wanted Redgrave to punch Clarkson.
"Just punch him!" I was thinking, but no. Also as regards any BBC charity relief event, the adverts for money went on for far too long, but that's ok - that's what the progress bar in any media player is for!
Overall verdict:-
Pros: Some funny moments - mainly from May.
Cons: Everything else.
Rating: 4 out of 10.
Final comment of this pseudo-review: definitely NOT essential TG viewing - just wait for the new season.