What do you mean by 'crying copiously'? If you mean its leaking sap, where from (leaves, main stem, branches)?

It seems to be leaking through the the stems and the leaves, but it has dried up through the day,

If you'd given it a good soaking after repotting (as you should) then that can sometimes mean the plant drips a sweet sap from the leaves, and it does stop as the water level falls, so doesn't sound like anything to worry about.

Thanks for answering so quickly.

The topmost leaves look like a bad greenfly infestation, though. Are tiny, soft, round green bugs clinging to the undersides of the new leaves?

Hello tugbrethil, thank you for coming back to me, with regard to the greenfly I can't see any, but some of the leaves are definitely curling under! also could you tell me is the sap poisonous? How should I treat the leaf problem?

If the "sap" is a clear, sticky deposit on the lower leaves, and whatever the plant is sitting on, that is further evidence of greenfly. I would thoroughly spray the leaves, top and underside, with a solution of organic dish soap, about 10-15 ml per liter. Repeat 2-3 times, about 3 days apart.

Thanks tugbrethil, I'll certainly give that a try,
Annieo