Well, I received an email for that reply.... Things are looking up!
The move as I know is is where you get 4 cards outjogged as selections, and during that you get a break above the lower 4 cards. These are the cards to be switched in.
The 4 selections are angle jogged to the left slightly and the deck is held in the right hand from above in a biddle style grip Your left hand comes forward from under the deck to take them. It also carries with it the bottom 4 cards, and keeps a break between these 4 and the 4 selections.
You then briefly touch the deck and the stripped out cards together, picking up the cards originally outjogged onto the bottom of the pack, leaving you with the 4 cards for the bottom masquerading as the 4 selections.
I think I've seen this on a Sankey DVD described as the Vernon Substitute Transfer, and I'm sure PG describes the same move as the Derek Dingle No lap Switch.
So i was wondering whether they are the same move, or I;m missing some subtlety in one of the moves that distinguishes it somehow.