Well it is covered now and hopefully this will keep it dry.
Not sure which way to go with this now as two differing views.
If I don't use the Ditra Drain, could I use a addy which can go on a green screed. TileMaster Ultimate can go on green and is S2. Would this provide a solution?
Best thing choose a tile adhesive supplier ring their technical. They will tell you .I'd go mapei as they always helpful but most big suppliers have a technical side