Followed @veronicade1's instructions:
Tap & Hold the Lock screen >> "Customize Wallpaper" >> go to "ADD NEW" hit '+' >> select 'Photos' @ top left >> Tap on image from those available to load image >> Tap on time >> select Font and Colour from "Font & Colour" menu >> Hit Save (at top right of screen)
Under new saved Lock screen image and Clock Font, Hit "Customise" to reveal the Lock and Home screen pair.
Tap Home Screen >> Select background from Menu: 'Pair, Colour, Gradient, Photos' to Customise Home Screen >> Hit Save (at top right of screen)
Tap on Lock screen and it expands to Full scree size and you're done.
Please note, my screen cannot display the text at top right, so where I wrote "Save", it might be some other text; i.e. 'Exit'