Statins certainly work, my brother had a total cholesterol of 9 and took a statin to lower it, he was prescribed Simvastatin at a high dose of 80mg which was then lowered once his cholesterol reduced (he eventually lowered it to below 4 and came off statins and now controls his cholesterol by exercise and diet).
Regards to Artovastatin, I'm sure that I read it is effective in a lower dose as Simvastatin is at a higher dose, something like a 20mg dose of Artovastatin works the same as a 40mg dose of Simvastatin, didn't save the article but a google search may say whether this is in fact true or not.
My mother also took Simvastatin but don't recall her cholesterol levels, both her and my brother didn't suffer side-effects but some people do, if you do
@Debzz_ be sure to mention it to your gp and report it to the MHRA Yellow Card Scheme:
https://yellowcard.mhra.gov.uk/the-yellow-card-scheme/