Which innovative retail strategy did the UK government implement in 2012 that revolutionized how government services were delivered online?

In recent years, governments worldwide have been implementing various retail strategies to boost economic growth and improve citizen services. One significant area has been the digital transformation of government retail services. This trivia question tests your knowledge about a major government retail initiative that changed how citizens interact with public services and created new standards for government e-commerce platforms.

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GOV.UK - A single domain consolidating over 1,800 government websites into one user-centered platform
Digital Marketplace - An online procurement system exclusively for government contractors
Tell Us Once - A retail service allowing citizens to report life events to multiple departments simultaneously
Government Gateway - A unified payment portal for all government taxes and fees