BT Sport crashed when you press the "Watch Now" button, tried on google nexus 10 tablet and S3 phone - same problem
Seems to work from PC
No such problems here with my Nexus 4 running KitKat 4.4.2 and BT Sports app v1.3.15
Same problem with an Asus Memo HD pad. BT Sports App opens, but as soon as I want to watch either the tablet freezes or I get a black screen.