Are you eating properly?There might be some problem in what you are eating.

I used to only eat once a day in the evenings, but now I try to eat more often. I usually have an apple or some eggs for breakfast and then eat apples or sultanas during the day and then my evening meal.I have cut out the most fattening foods ie: cheese, chips and biscuits.The problem is that nothing seems to be happening, if anything I am slowly putting on weight
Last week I weighed 71.5kg and today I'm up to 72kg!!With all the exercise I've done I would have thought I'd shed at least 2kg instead I put it on!

Are you doing any cardio?? You need to do cardio or at least walking - something that involves moving around to really burn calories and eventually fat. Sounds also like you may not be eating enough if all you eat is apples all day, body may be in starvation mode with a lowered metabolism.

Try eating a proper lunch it may aid with losing weight. Sounds like your not getting enough to eat during the day.

How long have you been exercising? It could be that you have a slow metabolic rate that’s why you are not losing weight. I’ll tell you to be more patient and continue with your exercises.