Zavvi are hopeless at fulfilling pre-orders on time, but now that Destiny is out, they're willing to sell you a new PS4 copy for £31.48 if you use a new account and the 'WELCOME' voucher code. Be aware that Destiny is quite fun, but basically consists of endgame content with no strong story or memorable campaign to keep you invested. Only loot. Still, if you want in, this is one of the best prices around. You'll have to wait until they get more stock in, mind.
Thanks to donthasslethe & oUkTuRkEyIII @ HUKD!