bought a cucumber plant nearly a month ago
I bought a cucumber plant nearly a month ago and since potting it up it hasn't grown at all and what leaves there are are dying off. The cucumber plant is in my conservatory.
I'm pretty sure the cucumber doesn't have enough light. You can start cucumbers indoors, but to actually grow them past seedling stage, they need to be outside, or supplemented with special light. This article has information on growing cucumbers in containers: https://www.gardeningknowhow.com/edible/vegetables/cucumber/cucumbers-in-containers.htm