Thank you for taking the time to help, I do appreciate your advice
You're welcome, I try.
sorry forgot to update my info:
I have the nagging feeling that the species was in the title of your thread all along and somehow I overlooked it, if so please accept my apologies.
I am living in London and currently the growing conditions are on a table near to the window. I read the advise on drafts ect,
Although I do not grow this species I keep nothing inside during the summer, moving tender plants inside only when fall approaches.
I also try to keep it out of the sunlight and instead use the house lihgting as I believe it needs as many hours of sunlight as possible.
I'm not sure that I agree with this as there is more to lighting than hours of light, quality vs quantity you know. Besides, summer solstice has just passed and there are plenty of 'hours of light' outside now. I am hesitant to offer you advice on a species that I am unfamiliar with, perhaps others who do grow Serissa can help you with determining the best location during summer.
As far as the possibility of over-watering goes, remember that it has only been a few days since you made any changes, it may take a while for any improvement to become apparent.