It’s interesting, there is also a photo of WP829 wearing No: 4, and I’ve seen on other pictures at Hamble that some other chipped at Southampton UAS have had several different numbers.
I believe Southampton UAS were in Silver or later Poly grey with dayglo. I was just wondering about the scheme I showed with the horizontal red stripe, I like it, I think it looks sharp. I wasn’t sure which aircraft had it and when?