Help please!

I’ve lost the catchuptv apps on the home screen on the tv.  All UK catchup channel apps have gone, I.e. BBC iPlayer, itv hub, all4 etc. if I press discover I can access the catchup that way via Youview but I was able to access Youview he apps from home only earlier today??

I’ve read some posts about ISP, switch off your router and tv and that should clear it but it doesn’t?  

There are apps apps on there that I have never heard or seen before?

Any help appreciated.

Craig