Have you tried the sport.bt.com website and looking under videos for UFC section. (Warning their could be spoilers on that site). If you have a Windows 10 PC then you should have the option of using the BT sport app. THat app is fairly new so I'm sure if it has all the catchup on it.
There should be UFC sections on the Android and IOS BT sport apps if you have a compatible mobile phone or tablet.
As I say be aware of spoilers on all if you are unaware of the results.