Trying Something and Failing, by Moi

I was gonna start a series in which I take a random Only Fools and Horses screengrab online and identity the episode it's from but this is the first one that came up and it’s so easy I feel like I’m insulting myself.

(Obviously the correct answer is obviously It's Only Rock & Roll, Series 4 Episode 4, you fucking hicks. I'll try again with a harder one, if such a thing exists for a superfan like me)