At the end of last week I noticed that my plants ‘ leaves were growing twisted and curled down and I realised that they were being attacked by mites and other garden insects because I had been putting them outside so I spent a very long time spraying them with Neem oil diluted in warm water and a bit of organic soap and it really worked wonders. The following day after the first spray lots of the little insects died so I spent a good couple of hours cleaning the plants with a lot of care.
I also removed the leaves that were in the worst condition.
It seems that both plants are bouncing back so there is still hope.