I wouldn't listen to him mate. Sounds like a typical gym dude. 'Muscle Fuel' sounds like marketing rubbish, cheap decent Whey would be the way forward with a decent source of carbs. This way you can make your own shakes and know exactly what's in them. I prefer it this way, I'm not one to enjoy endless sweetners and carp in my shake.
You probably should be taking protein shakes, unless you have an endless pocket and many hours a day to prepare all your food making sure each meal has a fair share of protein in. Which I'll guess you don't, so I'd pick yourself up some whey. Check out
www.myprotein.co.uk and type
www.sports-nutrition.net in the price matcher and use one of the chaps here's discount code as I cba to find mine and I'm sure they will appreciate it more than me

You're looking for the £22.93 Whey.
As to putting on a little more weight, I've always thought it was odd when people would say things like "Oh, you should be 12 stone by now". You've put on 8lbs, which I would consider good going for 3 months, quality rather than quantity is far more important.
If you don't think your progress has been great enough, and your routine is sound, then I'd look towards your diet. So supplement with the Whey to up your protein intake to around 1 to 1.5g for every 1lbs of bodyweight. I'd suggest no less than 1.5g per lb. Protein should be consumed every 2-3 hours but try and make the most of it you possibly can from decent food sources, chicken etc.
You do not want to be using this protein for energy, you want to be using it to repair/rebuild muscles etc. So make sure your carb intake is acceptable. When I began, I wrote myself a training plan, and a diet plan. The training plan was good, and so all I had to do was nail the diet. I had a rough idea of how many carbs protein fat cals I would need to be taking in, and with the carbs I would just adjust up and down by 500 a week if I found I was adding too much fat, or not eating enough.
A good source of quality carbs is oats, these can be mixed in with your shakes no problem. I was amazed when I first discovered oats, and I'm thankful for them. This was quite a long time ago now but they've been a good friend to me over the years. A low G.I source of quality carbs that you can take anywhere with you and can be taken with just water and protein/or by itself in a shaker rather than having to stop and prepare a meal.
ANY time during the day take your shakes with water, and before bed take your shakes with milk and a 5ml of flax or similar if you have any as this will slow down the speed of the absorbtion so your body will be absorbing for most of the night.
I'll read through this again later or tomorrow, I hope it makes sense as I am in rush to get out and only wrote this VERY quick. Appreciate it if anyone could fill in anything I've missed.