1B...
We have a fairly strong German presence in our flank. That is never good, especailly not when they harass the forces trying to take a bridge.
We have a fairly fresh brigade on their flank. That is always good, especially when it can 'easily' cut the Germans' supplyline. And thst can be crucial since the Germans are likely to have a lot of supplies and ammo with them. They haven't expected this, and aren't prepared to fight with no supplies like our troops are. It is worth the risk in my opinion.

2A...
Of course we use the night. As said the Allies didn't use the night much (surprise-effect for the Germans), but we have experienced and elite paras, some of the few Allied troops that have regualrly used the night in combat. Lets use that pool of experience.

3A...
Well, if we attack the Germans and try to link up with 3rd Bat, then those troops should stay where they are, or else we run the risk of 4th Brig being turned, or at least being isolated. And we can't have more troops being isolated right now. 3rd Bat is tired, but dug-in infantry is hard to dislodge, and Germans don't like to attack at night against undetermined enemies. If they do it is going to be a cakewalk for the paras. So I expect the 3rd will be able to rest throughout the night in their current positions, while moving them back will leave them tired for the next day.

4A...
Since we don't so anything really, I would say that we use the night... In any case it is important that we don't just let 4th Brig hang out there.