Customise Recent Content block to show only 1 content type I need to customise the 'Recent Content' block to show only 1 content type (i.e pages or articles).

This doesn't seem to be possible with the block settings so I presume that I need to clone and/or edit this block to restrict the content it shows?
A custom View (as a block) would solve your problem.

You can make it replicate the functionality of the 'Recent Content' block but minus the the Content Type that you wish not to include.