I've converted to drinking only water and tea and I'm cutting back on extras like chocolate biscuits I want to lose this weight before the summer and keep up a good plan of oversize to ensure I stay fit!
This is a good plan - make little differences to your diet rather than trying to change it overnight. I don't know if you still live at home and how much influence you can have over the meals you eat, but there are various ways to cut down on fat content without really noticing. It's all small increments, but easy to do. For example, I used to use semi skimmed milk, at 2% fat. Now, when I can get it (Sainsburys do it, Waitrose don't, so it depends where I pick up groceries), I use 1% milk - it's not fully skimmed, and I really can't tell the difference between 1% and 2%. nAlso, when I cook with minced beef, I buy pretty cheap mince for budget reasons, but once it's browned in the pan, a lot of fat comes out, and I drain nearly all of it off - that's a tablespoon of fat less in my meal. And I've just made my portions smaller - I used to serve as much spaghetti for me as ought to have been for two, and eat it all. Now, I'm down to a sensible size portion, and that fills me up fine, where before I was stuffed.
But snacking is the devil. I managed to cut out a lot of snacking last year, but it's crept back a bit over the winter, and I can feel the difference in my clothes, so now's the time to make that effort again. Again, you might just be able to lessen the snacks, instead of cut them out altogether. Don't get a packet of biscuits out and leave it by your computer. Get one out, and put the packet back in a tin, in the kitchen. Make it an effort to snack more.
Anyway, good luck - it sounds like you're coming on well already with the diet and the cycling. To increase your distances, can you find a circular route that goes around where your house is? If you do laps of it, then you can increase the distance you ride, without ever being too far from home if you find yourself really tired (instead of riding 5 miles out, and being stuck 5 miles away). As you get fitter, increase the radius of your circuit.