Full credit should go to member 'tdk2bu' who originally mentioned this possible deal in the thread about the White Xperia Play at Phones4U - if Mods feel this is a duplicate feel free to expire or amalgamate with other thread.
Confirmed this deal was 'live' at Phones4U store at Glasgow Fort - price labels clearly stated that for existing Orange and T-Mobile PAYG customers, the price was £129.95 with no top-up required. Sales Assistant confirmed phone would come with no network branding and would be unlocked.
He also explained (which was backed up by the Point Of Sale literature) that it included 10 free games (6 pre-installed and 4 downloadable - not sure what the games were).
He seemed a bit vague as to what constitutes an 'existing' Orange or T-Mobile PAYG customer and only stated that the sim had to be active and have credit remaining on it - I would imagine there would be a minimum amount of time that the sim card had been used for but just speculating on this - he did mention it is very simple to establish whether your sim is eligible for the upgrade price of £129.95 (just provide your sim card or mobile number if you don't have sim with you or you can even call your local store and enquire about the Upgrade deal on the Xperia Play PAYG and they enter the number into their computer and get an instant answer whether it is eligible or not.)
I fully appreciate this deal might be limited as it only benefits existing Orange and T-Mobile PAYG customers but thought it worth posting anyway.
The store in Glasgow Fort had 1 in stock and were expecting deliveries on Tuesday, Thursday and Saturday of next week. They only had the Black model available and no mention of the white ones anywhere and didn't look like they even stocked them. Their telephone number is 0141 773 2697 if anyone wishes to call and confirm deal and to check if their Sim is eligible for Upgrade at the £129.95 price - you can check the Phones4U website and get the phone number for your local store.
Hope it helps some.
UPDATE - ALSO WORKS WITH O2 AND VODAFONE UPGRADES - O2 PRICE IS £129.95 AND VODAFONE IS £139.95.