did you win it LOL
after i started this thread and getting no replies. i was hunting on ebay,
i found a seller who was selling loads of lee kit
i ended up with
0.6 , 0.9 nd grad (hard)
square polariser
2x filter holders with tandem adapter
2x 77 mm filter rings (one wide angle)
all for £360. only the holders had been used
so here is how it works
you connect the 2 holders together with the tandem adapter , the polariser then sits in the front holder, so that it can rotate independently from the rear holder that you can put nd or nd grads in.
obviously if you are only using a polariser you only need one holder
not tried it out in the field yet, but im impressed with the lee quality