Brentford tickets - guest sale likely?

[mightyspur]

I'm going to the Brentford game on the 2nd Dec and a couple of my mates (non members) have asked if it's possible I'll be able to get them tickets. Unfortunately I only have a One Hotspur membership so I'm limited to 1 ticket unless it goes to guest sale, but there is absolutely no information on when this is likely to happen. Website just seems to suggest it's unlikely to happen, but there are no dates given for each of the games as to the cut off as to when it actually can happen!

Anyone know roughly how close to the game the decision is made to go to Guest and/or general sale?