Although he missed both the automatic qualifying time and the 2% consideration standard, Chris Walker-Hebborn can be selected to the British Olympic team only if he will be saved by the discretion of the NPD and the head coach, because the team is highly capable of sending their best backstroker to the Games, most especially that he is needed in the medley relay (GB won a place as a top 12 nation at the World Champs in Kazan).
For the 200 m butterfly, I'm sure there will no swimmers from GB as none of them had reached both the qualifying time and consideration standard, and could be saved by the staff.