Austria has almost the same laws as Germany: personal use is legal, selling is not. Trafficking is a felony in Germany but only a misdemeanor in Austrian. But you still have to rely on the black market like in any other European Country now.
Slovenia i don't know, i don't speak their language. In the UK i read the boards and came across some sources over the years. i got the impression that law enforcement there does even care less about the underground steroid market than in mainland Europe.