Very good price for the Tab Pro. (4G Model, White)
This will work as a phone if you so fancy !!
The Wifi-only model from John Lewis is £250 and got to over 500C. (http://www.hotukdeals.com/deals/samsung-tab-pro-8-4-reduced-100-249-john-lewis-1940746 )
Whether you need the 4G model is your choice; but for another £45, it provides a lot more flexibility in my opinion.
Amazon delivery - so at least you know it is not being shipped from a warehouse in the far east.
The new(er) Galaxy Tab S 8.4 is out soon in a few days.
Will have a better screen but the Wifi only model is being priced at £319.
The 4G model release date is not known yet.
(speculation suggests £399 for the 4G model)
Again, whether you want to wait a few months and spend £100 extra for a better screen (same pixel density of ~360ppi but better technology) is entirely up to you.
At this price, the Tab Pro 8.4 4G is a great deal IMHO.
You don't have this model cheaper elsewhere.
Full specs here (Model # SM-T325) >>http://www.gsmarena.com/samsung_galaxy_tab_pro_8_4_3g_lte-6049.php