The new situation after the British 16th Brigade arrived in September 1941

The newly arrived British 16th Brigade went in with an aggressive spirit and a positive attitude. They were going to take the Australian outposts and set them up as Observation Posts. They would then concentrate on "offensive patrolling". Despite that plan, the truth was that the outposts outside the wire ended up being taken by the enemy soldiers and setup as "defended localities". The plan was still to plan on dealing with enemy attacks. There was cause for concern, because the enemy outgunned the 104th RHA, which was supporting the 16th Brigade when they would take over from the Australian 20th Brigade. The 104th RHA had 24 guns, two of which were anti-aircraft guns. The anti-aircraft guns were only there in case of a tank attack, when they would be manned and available to fire on enemy tanks. They only had 16 25-pdr guns, 4-60pdr medium guns, and 2-Italian 149mm guns. The enemy was thought to have 52-field guns, 16-medium guns, and two heavy guns. Given that the enemy had much more artillery, the 104th RHA expected that the enemy could be expected to attack.
The 20th Brigade really did not understand the situation very well, because all they saw made the enemy seem to be at a considerable distance. Still, the 20th Brigade commander expected that any attack would be likely to come against the line south of the Bardia Road. The 20th Brigade didn't like the defenses, because the secondary line were small enough that when there were two battalions, one from the division reserve and one from the brigade reserve, the second line was "congested". The second line of defense was too far back from the perimeter, so that the brigade reserve battalion was remote from the perimeter. They wanted to build a new position that was closer to the perimeter.
The 16th Brigade arrived to replace the Australian 20th Brigade on 25, 26, and 27 September. The next day, 16th Brigade took responsibility for the defense of the area. Two British battalions were in the line and one was in reserve on the secondary line. During the first two days of October 1941, the Polish Carpathian Brigade replaced the Australian 26th Brigade in the west. The 26th Brigade then was made the division reserve brigade. They had spent 8 weeks in the high-pressure Salient.
The western sector had four battalions. When the Polish Carpathian Brigade arrived, the 2/43rd Battalion stayed in place. The Polish cavalry had been in the Wadi Schel, so they now were back with their parent unit. This is based on the account in Vol.III of the Australian Official History.