You have to be very careful showing your cards to another player when there is still action to take place as local rules on this vary. For instance if you show your cards to another player in a comp at the Circus in Stoke - on - Trent then your hand is declared dead.
Likewise in Brighton.
In this instance i would probably realise that the UTG/BB are a bit clueless, i would ask the BB to table his hand so the other guy knows what he has i would then let the remaining 2 players play out the pot. After the hand i would issue a time/round penalty to the BB and UTG players.
If they do it again at any point, or know what they are doing in the first place, then i would declare both hands dead.