I am told there is a change of plan from last.fm
They will now exclude track love and user play count sync from rate limiting from the end of this week. However they want me to use the existing API key, so that means similar artists and artist bio's will be unreliable for some months.
Fortunately I have now added in fallback functions, so if last.fm fails, the data is now retrieved from other sources.
As previously mentioned, all artwork retrieval from last.fm is no longer allowed and the replacement is wikipedia, and google (along with fanart.tv which still works)