Against album cover:

https://en.wikipedia.org/wiki/Virgin_Killer

That needs a NSFW warning. Fuck.

That seems a bit random

because the artwork is of a nude 10 year old.

ever been to beach in Europe, particularly naturism beach? not sure what's problem here, apparently some puritans who are fine with violence but consider naked body disgusting

oh that makes more sense to me

To be fair to the Scorpions, quote from Wikipedia...original concept for song

'...Time is the virgin killer. A kid comes into the world very naive, they lose that naiveness and then go into this life losing all of this getting into trouble. That was the basic idea about all of it' Different times... https://en.wikipedia.org/wiki/Virgin_Killer

Not, strictly speaking, the UK government. The Internet Watch Foundation, a non-governmental organisation, placed the article/image in question on its blacklist, a list which most major UK ISPs use (notable exceptions at the time were the UK universities' and military networks IIRC).

AFAIK, whether or not the image is actually illegal under English law is somewhat unclear (the definition of "indecent" is rather woolly), though it's certainly a poor choice for an album cover.

Edit: "to its blacklist" -> "on"; added "a non-governmental organisation"

The IWF is a quango, not really nongovernmental as such.