Need to hurry here ;). I initially missed it, but now it seems that EE has sweetened the Lumia 920 and 820 deal by offering free wireless charger worth £39.99. There is some confusion though. On Lumia 920 page it says offer lasts until the end of December, while stock lasts. But move over to Lumia 820 page and it says first 2500 customers who purchase Lumia 920 or 820 will be eligible for free wireless charger offer.
Hmmm !! You need to be really as early as possible here, if you have made up your mind for Lumia 920 in UK. EE is the only way as of now and even Phones4u is offering EE plans only as of now.