Jno //pixie, you can change your name by common usage, but only up to a point. If you want to change it for good it will have to be by deed poll. Elton John in court would be charged as Elton John. Tommy Robinson won't be charged as Tommy Robinson.//
That isn't accurate. If it's legal, it's legal. Nobody actually changes their name, we are all registered under our "real names" (at birth) when we die. Whether people choose to temporarily call themselves something different while they are alive, is up to them. Lots of women register a different name, after marriage. It is just as legal too, just not permanent.