Sure, I'll give a basic summary of my diet and routine....
In terms of diet I took a slow and steady approach to this. I began by dropping all food that was high in refined sugar and simple carbs. So no more chips, cakes, chocolate etc. During my lapse I had also been eating upto 8 slices of wholemeal bread per day. Even though wholemeal bread is much better than white, I realised that was excessive. So I reduced it to a couple of slices per day.
My diet was still too excessive for cutting, but I didn't want to reduce my intake too drastically at first because I needed the energy to work out and build some muscle back. Also, it's much better to ease gradually into a cutting diet than to do it suddenly.
I made sure I kept my protein intake high. I bought some casein powder and used it to make protein pancakes, mixed it with oatmeal and peanut butter to make my own protein bars. These were great snacks and very filling, and also helped me sustain my muscle while cutting. In terms of meals, I'd eat chicken, tuna, steak and minced beef. I'd have this with a bit of gravy and mixed vegetables. Or I would mix up some plain yoghurt with a spoonful of curry paste to make my own curry sauce, which was great with chicken. I also followed my workouts with whey protein of course, as well as creatine.
As I eased towards more of a cutting diet I simply cut out all bread and tried to keep my carbs quite low. I had oatmeal for breakfast and then most of my carbs for the day would come from vegetables.
I tried to avoid cheat meals because I've always found that high sugar/simple carb foods are addictive and every time I have a cheat meal it leaves me craving for more. It's much easier just to cut that stuff out altogether. It's tough to give up for the first weeks, but once it's out of your system it gets much easier.
I didn't do a lot of cardio. I had learned a valuable lesson during a cutting phase some years ago. I'd done a lot of HIIT and strict dieting and ended up losing a whole lot of muscle. I'm not saying you shouldn't do cardio, but you need to find the right balance with your diet.
Once I had regained some muscle mass and size, I realised it was time for some more intense cutting. I was in much better shape now, but I was still quite soft and podgy. I decided to try a low carb diet for 6 weeks - no oatmeal, no vegetables, no fruit, just meat, eggs and protein powders.
Within the first week I dropped a load of water weight. Over the coming weeks I started dropping bodyfat too. I couldn't believe how quickly it was happening, and I was still maintaining my muscle. 3 weeks in and my abs were showing, I could see striations in my shoulders and people I work with were all saying how great I looked.
However, by this time I was really starting to feel the side effects. I felt so drained and tired. My sex drive plumetted, as did my boldness and confidence. I started getting emotional. It was really strange how it messed with my mind.
What's more, the lack of fibre in my diet led to me being constipated, which is very risky and can lead to all sorts of complications. So by this point I realised I needed to let up a bit. I decided to cycle my carbs. I would have one day where I'd eat moderate carbs - oatmeal and plenty of vegetables. And then the next day I would cut them out. I kept this up for another 2 weeks, by which time I was looking lean and in good shape...and I had managed to drop bodyfat without much detriment to my muscle gains.
Once I was happy I started easing back into a maintenance diet. Right now I keep my carbs moderate, with oatmeal in my homemade protein bars, vegetables with my meat and the odd slide or two of wholemeal bread throughout the week. I avoid all high sugar/simple carb foods. Although the odd lapse won't do my physique any harm, I know how addictive these foods can be and how hard it is to stop once you get started. Besides, I honestly don't miss or crave junk food any more.
Now for my workout....
Because I suffered a pectoral injury, and have previously injured my ankle, I cannot lift particularly heavy any more, so I've opted for a high volume routine, approximately 4 sets and between 8-18 reps of each exercise. I stick to free weights, with most focus on compound exercises such as squats, deadlifts, (flat and incline) bench presses, push ups, dips and military presses. I also mix in some lateral raises, arnolds and bent over rows for my shoulders, shrugs for my traps, wide grip pull ups for my lats and work my abs with crunches and planks. I'll do some bicep curles and leg presses once per week as these groups get worked during my compound exercises anyway.
I kept things very basic, worked out 4 days per week and never spent more than 1 hour in the gym at a time. I focused on perfect form and contracting the muscles with each rep. During my cutting phase, I lowered my sets down to 3 for most exercises and also found my rep count dropped. This was partly due to lack of energy and loss of strength (those cutting phases really hit hard!) but I didn't want to over-tax my muscles while I was at a calorie deficit.
I think that's about it really. If anyone has any more questions I'm happy to answer. Obviously every person's body is different and what works for me isn't guaranteed to work for someone else. Personally speaking, I find I gain muscle quite easily, but I gain bodyfat very easily too.
Here are a couple of Youtube channels that I highly recommend. The first shows you plenty of recipies for healthy snacks and meals. This can be very helpful when cutting. Without my protein pancakes and home made protein bars, I'd have really struggled.
http://www.youtube.com/user/leanbodylifestyle
I only discovered this next one recently, but 99% of what they say I can verify with my own experience. They give extremely good advice and are really funny guys...
http://www.youtube.com/user/twinmuscleworkout