Amazing blackjack game found, math heads please advise on house edge

[gfkostas]

I found this blackjack game at pocketwin which seems to offer the following rules:

unknown number of decks (am waiting from support on this one but given the amount of 10's that I see it can't be 6-8)
double down on any 2 cards
1 split allowed
no double after split
UK game
If you have BJ and dealer shows a 10 you win (dealer won''t take another card for some reason)
If you have BJ and dealer shows an ace you win (dealer won''t take another card for some reason)
Stands on Soft 17.
BJ pays 3 to 2.
Can take additional cards on split aces.

This gotta be a positive game for the player surely? Anyone can calculate the house edge?

 

[gfkostas]

Nop, am wrong.....it's not positive but only if 1 deck is used (I think).

Two-deck house edge = 0.1655%
Six-deck house edge = 0.3651%
Eight deck house edge = 0.3899%