Hi All,
The nail knot variant Alex mentioned earlier was shown to me by Glanville H (now with Nomad) when he was guiding out in the Oman (Musandam).
Basically slip the swivel onto your leader and pinch the two strands together between your finger and thumb to form a loop with the swivel in the middle. The swivel should be sitting up around the base of your thumb. Leave a tag end of 8-10 inches. Wrap the tag end around tightly around your finger and the leader 3-4 times (depending on the weight of line). Then poke the tag end back down the side of your finger nail and under the coils you just wrapped. Then wet and snug down.
On lighter lines, after you have made the wraps around your finger-end, you can put the tag end back through the eye of the swivel before poking it out under the coils.
Seems a good reliable knot and can be used with 300lb leader.
Cheers all. Dave