the question of when to declare here is intriguing
i can't really see the aussies doing anything spectacular in this match, they have been poor - this is not a good aussie side. so its a balancing act over leaving enough time to win the match against losing too much time to bad weather. think the tactics will come down to the weather forecast, 6 sessions left, if aussies bat well we may need 4 to 5 sessions the get them out so outcome = draw. if they are abject again then we will win. if weather intervenes then probably draw. without the weather factor i would definately bat on for a session, giving a lead of over 400 then having 5 sessions to get the aussies out. with the weather factor its the captains call, though what i will say is that this sitaution must present itself in english cricket time and again due to our weather so i'm sure the captain and management know what they are doing