Received the “correct” figures from SSE, which turn out to be 22%, as originally stated! The Complaints dept rang me to talk about it, and he said that the announced 14.9% was an average – huh.
I did, however, discover from him that to get the fixed rate on E10 you no longer have to go paperless (it has dawned on them that not everyone uses the internet for everything). A pity they didn’t change the rules before the price rise!!