Thanks for all your prompt replies. I just wanted to give everyone an update. Sorry it wasn’t sooner, I have been a bit busy lately.
The kitten is doing really well, thanks to your suggestions. I initially gave her a bit of canned tuna in spring water which she was very happy to have. She has also taken a real liking to chicken which I give her raw. I haven’t given her milk yet. I read kittens need to have a special ‘cat’ milk and can’t really have cows milk. I still have to buy the formula for that. She is drinking plenty of water though. I was worried because she wasn’t going to the toilet, but last night she left a nice present on the welcome mat HAHA
Initially she was very scared and hiding in corners coming out only for food but now she is very playful as kittens are. I am going to take her to the vet tmw and see if she has been registered with an owner. If not I am planning to adopt her. I would never ever have imagined getting a pet but I am experiencing the joys of owning one right now and I don’t know why I didn’t do it sooner… probably the money factor. 
I have given her the name Misty. I will try and upload a photo of her later tonight. Thank you all.