Ok, last night:
After gently pulling the leaves off (took 4 tiers off, 3 came off with a gentle pull, 1 had to be cut and the other side of the node just pulled off)
Then gave a nice water, a bit too much though. Containing 15-30-15 + epsom salt.
This morning, about 12 hours after doing so, no signs of improvement.
I'm going to work, so hopefully it will be different when I get back, but if not, anymore ideas?