@WillC Thank you for getting back to me. At the moment it is about 3 metres from the window and the window faces north-west. I have recently moved house and it seems that it's got worse since moving so I don't know if I've put the plant in the wrong place.
I water once the top layer of soil feels dry which is usually once a week sometimes a little over a week. I tend to use a small jug I have which is 300ml and I fill that up twice so 600ml in total - is this too much or not enough? The water in our area is hard water and I've looked at getting a water filter, would you recommend I buy one? I also spray the plant with water every other day as I know it likes humidity but again I use tap water for this.
Thanks,
Hayley.