You can download a PDF to mail in from the nice new site, but if you want to do it online the new site will direct you back here.
(Not wanting to seem harsh, some things are being done well, but let's not get carried away and forget all the many, many things that are still truly dreadful and need fixed.)
It's still in active use and it's still terrible. Those are simple facts that doing the relatively easy job of moving a bunch of PDFs and static web content to a new site are not going to change.
Government IT (in the UK and elsewhere) has been, and still is, totally fucked up. Let's not hide from that fact because it's only by publicizing the sorry state that it's in that things like alpha.gov.uk can get any traction compared with the traditional way of doing things. But even that's low-hanging fruit compared with the regular billion pound disasters that government IT procurement regularly delivers.
The old website only persists because a few remaining functions have not been transitioned yet. It's rubbish, but it's actively being replaced. Criticising it is pointless.
It's interesting that you refer to alpha.gov.uk. The gov.uk site left the alpha stage and officially launched in October 2012, and as much as government IT projects are usually a disaster, you can't deny gov.uk is a major step in the right direction.
All the most popular links on gov.uk take me to a very nice landing page with an overview, but if I actually want to do something they all link out to the existing web apps. Some of which I've used and are not terrible, but not likely to win many design awards either.
It's great that the UK government is no longer consistently failing at the simple task of putting information online, but anything past the 20th century web still seems beyond them. Hopefully it's the next step, I don't really envy the people that need to make that cultural change happen. I do however feel it's more likely to happen sooner if we don't pretend that it'll just happen magically by itself.
I did spot a mock-up of a form for reporting lost Passports, which when I googled for it was a nice 3 question form which after processing your answers used that information to give you a link to the correct PDF form to fill in and post (ok, to be fair it gave some helpful extra contextual info like the relevant countries embassy info, but to be unfair if you ask it about an Adult passport, then want to know about a child passport--because I'd imagine losing your whole families passports at once is relatively common--it forces you to answer the remaining 3/4 questions again).
So, some little steps in the right direction as far as web apps for interacting with government are concerned.
https://www.gov.uk/government/organisations/department-for-w...
As a Brit, the new Gov.uk site makes me feel very proud, even though I had nothing to do with it. :o)
I mean it was designed to be used on a touch-screen interface by people of all ages, they're going to have to lose some functionality for that alone.
One of the things the British Government is doing properly at the moment is their digital strategy, their new web site gov.uk has won multiple awards.
If you go to the DWP's home page it does tell you it's an old site, and should probably redirect, but it's unfair to criticise something that's not the current implementation. Most of the links from that front page go to the new gov.uk version, and I guess you'd have to work hard to find that error page if it wasn't already bookmarked.