Thanks for your response Gazza.
As you say, selecting an album which is on the downloads share then touching the three white dots gives a range of options, one of which is delete album. However, if the album selected is not on the downloads share but is one directly ripped by the Core, then in that case these steps do not offer delete album amongst the options. Not for me anyway. Incidentally, for me the album cover does not appear top right but in the centre of the screen on my Samsung Galaxy J3
I was surprised and perplexed when I discovered this was apparently set up so that an album once ripped is with you forever. Shurely shome mishtake? Or am I missing something?