[mdjlucan]

It's been infested with Aphids Does it look like he's got a virus It's the colour of the leaves I'm not sure about

[jambop]

Give it a spray with something to kill off the aphids and it will pick up again.

[Goosegirl]

The leaves of plants that have a virus infection tend to show more irregular yellow and green markings whereas they look a bit more like a mineral deficiency. Not sure but try some dilute Maxicrop and see if that helps.