Russell T. Davies has confirmed that Cucumber is a one and done story and will not return for Season 2.
However, Davies has discussed possible second seasons of spinoff shows Banana and Tofu with broadcaster Channel 4:
‘No – ‘Cucumber’ comes to an end. It has a beginning, middle and an end … Part of us is dying to continue. I went into this saying it would be one year only for the whole thing – then you make it and you think, ‘Oh, it’d be nice to make some more of those,’ and you’re tempted back.
”But we’re talking about Banana because it’s an anthology series and I’ve loved discovering new writers and new directors with it, so that could continue.”