Access Keys enable navigation from the keyboard or other assistive device, normally using the alt-key followed by a number or letter.

This site makes use of the following access keys, to enable effective keyboard navigation:

alt T = Text only mode
alt G = Graphic mode
alt 1 = Home (UK Goverment Access Key Standard)
alt 0 = Access key information (this page)(UK Goverment Access Key Standard)
alt S = Skip nav (UK Goverment Access Key Standard)