On the odd occasion I have seen an image I'd like to save. However when I click, on the lower right hand side of the iPad on "save image" it always fails - I have never been able to save a single image. Am I doing something wrong or is there something that I need to switch on on the tablet?

For an image on a web page, just touch and hold the image, and choose 'save image'.

To capture a screenshot, you hold the home button and click the power button.

Many thanks Stig for the helpful advice - that worked!