The latest Hachette partworks is now available from W H Smiths. Warhammer 40000 Imperium part 01.
My first impression is that you don't get that much for your £2.99, just two plastic figure kits - a Space Marine and a Necron, six D6 and a plastic ruler plus all the usual printed stuff, but I still bought issue 01, just because I had money on my WHS gift card.
I don't expect I'll pick up any more issues, they are too expensive and there's no way I'll be subscribing.
For more information see this link.