hi i started training 6 months ago weighing only 11st 6 (waist 34, chest 38 height 5ft 11), training 6 times a week and a different body part for an hour a time.
i changed my training program 4 months ago training once every 3 days making sure to get squats in aleast once a week. Since then my weight has sword to 14st 8pounds (waist 31 inches, chest 43 inches, arms 16inch (after training).
but in the last month my gains have stopped dead, i have between 6 and 7 meals aday leaving a 1.5 hour gap in between.
Can any one offer any advice?

Meal 1

10 egg whites
2 whole eggs
1 pint of skimmed milk

Meal 2

scotts oats
1 pint skimmed milk

Meal 3

baken beans on toaste
1 pt skimmed milk

Meal 4

tuna or fish sandwiches

meal 5

chicken breats and brown rice
1 pint skimmed milk

Meal 6

jacket potato filled with tuna

Meal 7 (training days)

Chicken with noodle

Plus 1 whey protein shake before bed.

Every one has growth rates at different times throughout year, as a beginner you will make quick gains and they will slow down for a while. Its very common to gain a stone or two in your first year. 6 days per week training is too much for a beginner. Drop back to 4-5 training, remember you only grow on rest days and your only having 1 days rest which aint enough mate.
You drink to much milk, better to substitute with protein powder and water.
Even non fat milk can make you fat becouse of milk sugar, about 20g (lactose) per pint and it takes forever to digest. Your gains have slowed down so i would now suggest a slight change of plan as above.
Make sure you train your whole body once per week and youll be fine... until your gains slow down again!  :-/