I realize this is mostly a British thread, but two or three manufacturers here in the US make what they call "True Medium" strings, which are actually standard mediums on both Es and the B, and standard lights on the other three strings. The logic behind this is that in a normal guitar set, the A, D, and G are under more tension than the others, and in these sets, the tension on all strings is more nearly equal.

The incidental effect, though, is that if you put them in DADGAD, you have the almost exact equivalent of a standard light set in standard tuning.

Just a thought.

Peter.