In my conversations with fridgies over on that side of the pond, 100mm is ideal and the best for good HP performance. When I did my moms house back in 93, we had typical 12" on a concrete slab and NO heat on the second floor (1st floor to you Brits). I never use 12" anymore in a slab, always max of 8" and 4-6" in gypcrete. Their tubing is 15-16mm OD typically, same as ours.
I'm curious to know what the air temp difference is between main and upper floor is because in my moms house it was only about 2-3C which was much better for sleeping.
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