The RSAB I think are a nice granny hold bought at the right stage of the % rate cycle but not now unless you are an absolute bear that see Prefs bunched up eventually at the ridiculous levels of BP.9%. RSAB are worth 80-85p no more. The value is potentially in the common stock . If you really like the RSAB they are OK over full cycle. but you may experience a capital loss when % rates rise when it would be inconvenient to sell. I added to ordinary RSA today. Lovely company and global.