vapour barrier/vapour control layer

I wouldn't use either of them, I would use a breathable membrane similar to that used on roofs.

 

The colder air is coming from the brick side so putting it on the inside of the wood would do exactly that.

You should have put it on the brick side of the frame and set the frame in 50mm from the brick work.

 

I am not trade, but, the vapour barrier is to stop warm/moist air from hitting a cold surface, therefore condensing and producing damp.
The vapour barrier should be between the insulation and plasterboard. This is what i was told by one of the insulation suppliers and made sense to me

 

Warm and moist in the same sentence??

Cold produces moisture not heat.

 

Warm air holds more moisture than cold air, so when the warm air hits a cold surface, the moisture condenses.

 

What the Dr said, it's why mould appears on bathroom ceilings and around windows etc

 

Definitely a vapour control layer should be either directly behind the plasterboard or even in it (e.g. foil backed, insulated PB with VCL). Condensation is when warm air, which can carry a lot of moisture, hitting a cold surface which is below the dewpoint for the humidity of that air, so if you put a vapour barrier on the cold side, you risk condensation inside the stud wall because any warm moist air getting through the insulation will condense on the first cold thing it hits. It would have been preferable to stand the stud wall off the brick with an air gap and use insulation board, osb or mesh to hold the glass wool in. When battening direct to a brick wall, you could install a second vapour barrier to stop penetrating damp rotting the studs/battens, but if the external wall is waterproof this is unnecessary.

Incidentally, cold air is "drier". In very cold places - scandinavia, alaska the air can get so cold with so little water vapour in it that static electricity doesn't dissipate easily (another effect of warm moist air - it dissipates static) and there is a bigger problem with nuisance static. I remember travelling through Anchorage many years ago in a group, and if you shuffled your feet on the carpet in the airport terminal you could charge yourself up so much you could get a 1" spark from your finger onto metalwork and/or unsuspecting mates!

I'd just use foil backed PB.