It is available, but only at Argos and Comet, and supplies are limited.
The box will cost you £60 - £170 and then you have an installation charge of £80.00 (absolute rip off, installation should be no more than £50 or so).
Considering Sky already offer their installed FFS service for £150.00 all in for a new customer or free for customers who are out of contract (the best way to do it is to take the minimum subscription for a year at £16.00 per month with a free Sky box and installation, which means you will pay £192.00 over the year, but get some decent channels and free internet during that time, and then cancel the subscription and go onto the free service).
MASSIVE CON - This service is supposed to be for people who don't want or can't recieve Freeview (which IMHO is a load of garbage as half the wirral needs a £150+ ariel installation to get every channel). However, whilst it has 72 channels (compared to 150 on FFS), it does not have the likes of Channel 5, these are only available on Sky as they are FTV and therfore encrypted and not FTA, although FFS customers can recieve them.
All in all: stay away, stay well away - this service is the next BSB, once the BBC and ITV realise it is a waste of money and people don't want it, it will be eaten up by SKY and probably become BSKYFREESATB lmao