In short... try it. Someone else posted on here a similar scenario a couple of weeks back, and was able to return.
As far as the law goes, the material issue is where the contract was concluded - whether face-to-face (no statutory "change of mind" right of return) or via distance means (you're covered).
Click & collect type purchases, are covered - because you purchase online - regardless of the collection being in-person.
So in-law, you shouldn't expect to be covered. But if EE's process allows the return - go for it.
