How do I group images on a page?

How do I group images on a page please?

This is not “common”.
You need to tag the question “draw” / “calc” or “writer”.

As far as I can tell Images behave differently depending on whether they were inserted into a TextDocument or into a Draw or a Calc document.
For images directly inserted into a Wrriter document, I don’t know a way to group them with one another or with different shape-hosted objects.
Writer uses a basically different object class for images as compared with Draw and Calc.
I don’t know the reasons.
If you insert images into a Draw page (e.g.), they also are shape-hosted and can be grouped. This will not change if you later import such objects via Copy/Paste into a Writer document. Even after having ungrouped them they will still be handled as shapes and can be grouped again.

If you reversely insert an image first into a Writer document, and Copy/Paste it later into a Draw or Calc document, it will automatically be assigned to a shape as its .Graphic - and the shape can then be grouped.

And don’t forget images can also be inserted in Impress! So again a different case. Consequently, @AWoodJ, retag your question and edit it to better explain what you want to achieve in which context.

You can stick images into a table in Writer. This is not grouping, but if you want to lay out a bunch of similar images with text, then it will do the job.