Critique my diet:

I have gained a good amount of size and strength whilst being relatively relaxed about my diet. However, this relaxed approach has allowed me to recently slip and I have cheated far too often with exams etc. Now they are out the way, I want to start a new programme.
Aim of the programme will be to maintain (/potentially gain a little strength) and lower bodyfat.
I am currently 6ft1, 91kg.

TRAINING:
Cardio is: 30mins steady pace 4x a week prior to meal 1, HIIT 1/2x a week prior to meal 1.
Weight training 1.5 hours after meal 2 (with coffee as a pre-workout.)

DIET:
Meal 1: can of tuna, oats + bran, green tea.
Meal 2: 2.5 large chicken/steak + spinach sandwiches
Meal 4: post-workout shake - whey protein, dextrose and creatine
Meal 5: vegatables and chicken/fish

Snacks - 2 portions of fruit.

Opinions would be appreciated.

Hopefully you are not planning on eating spinach every day.
It contains a lot of nitrate and it's advised (where I come from) to eat it only once a week.

Hahahaha, thats true. The only way to get BIG is eating a lot, healty but a lot. The only source of protein isnt fish and chicken. Mix it up, beef, steak, maybe eggs sometimes, beans are packed with proteins(and is cheap). Milk is awesome to build muscle( if you are not lactose intolerant) . Include some more carbs. And there is like a zillion of vegetables and fruits that will give you all the vitamins, minerals, antioxidant, etc that you need
You need fat also, peanuts, olive oil and avocado are rich in good fats.


Remember you should enjoy your meals 

You should've been clearer, gaining strength and cutting in the same time for someone who lifted for 2 years is a hard and picky business.
If you want to cut, then just think about cutting and preserving your strength so you don't lose LBM - period, that's all.