I would imagine that they will just show the normal Apple ads (adapted for the U.K.) with, perhaps, a brief postscript that they are available only on o2.
A couple more: microphone, volume buttons, ringer switch, proximity sensor, different headphones (with mic and button). Casing (size and materials) is different too and the screens are I believe not quite the same size. Batteries may differ too?
Given the price of the iPod touch, the iPhone's £269 is clearly NOT subsidised. Apple is clearly not making a loss on the sale of the iPhone at that price. The revenue share is an agreement for Apple to make more money on the iPhone per month... that is not a subsidy. It is revenue.
In the traditional phone market, the cost of the phone is subsidised in order to tempt users to buy into the agreement. The subsidy is recouped on the monthly contract. The complete opposite is happening with the iPhone.
All I'm saying is that neither of us can have a definitive answer to that. Only Apple know that.
However, if Apple are keeping the price artificially low by using the revenue sharing money, that is how the subsidy is possible for them. Via the route they've taken.