Using Celotex

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Bit confused here. I've got a single skin block wall which I want to insulate with Celotex.

So the plan is as recommended by their website:

Wall - Celotex (with joints sealed by foil tape) - 25mm battens screwed through Celotex into wall - plasterboard screwed to battens.

The website talks about using a membrane...where does this go and which way should it face? Can I use the same breather membrane like I used under the roof tiles?

Should I use a polythene sheet inbetween the block and Celotex to stop water coming through?
 
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Normal application is to put the membrane against the outside wall then the celotex, but in theory its up to you, the foil backing on the insulation acts as a vapour barrier in itself.
 
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Thanks. The barrier membrane has printing on it saying 'face this side out'. So does that face the inside of the room or the brick?
 
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