How do I access the secret Sky Installers set up menu?

On a standard Sky box, or a Sky+ digibox you press the following sequence of numbers on your Sky remote control.

Services
4
0
1
select

and you will access the secret Sky installers set up menu.

On a standard Sky HD box, or a Sky+HD digibox you press the following sequence of numbers on your Sky remote control.

Services
00
1
select

and you will access the secret Sky installers set up menu.