Many sections of HMRC's website are now integrated into gov.uk. For example the PAYE (Paye-As-You-Earn) for employees/employers/agents. Have a look at the screenshots [1], the UX is superb. In a single page, you clearly see your gross income, your estimated income tax, and the history of pension contributions.
I see there are guidelines about coding in-the-open in Scala [2].
>In a single page, you clearly see your gross income, your estimated income tax, and the history of pension contributions.
And now so can Google thanks to gov.uk forcing use of Google Analytics on all government departments just because "it's private industry best practice".
Injecting untrusted third party javascript controlled by a foreign corporation into the tax forms of all citizens seems absolutely insane to me.
I see there are guidelines about coding in-the-open in Scala [2].
Or, have a look at the todo-list of the DWP [3].
[1] http://hmrc.github.io/hmrc-screens/
[2] http://hmrc.github.io/
[3] http://dwp-digital-services.herokuapp.com/