The arrival in September of &lt;a href="1st%20Searchlight%20Regiment%2C%20Royal%20Artillery"&gt;1st S/L Rgt&lt;/a&gt;, which had been re-equipped since its evacuation from Dunkirk, allowed 45 AA Bde to complete the illuminated areas of South Wales. 1st S/L Bty of 1st S/L Rgt relieved 484 S/L Bty, which was intended to move to another site in the brigade's area, but AA Command decided instead to enlarge the illuminated area round the important naval base at Devonport, which was already subject to air attack. On 28/29 September, 484 S/L Bty was moved to Plymouth, with BHQ at Bull Point Barracks, Devonport, where it came under 55th Light AA Bde.