is it not possible to get skysports catchup
ie on sky you could watch old boxing and football matches.
Watch any content which had been on sky sports that you had missed or want to wAtch again
There is Sky Sports VOD content, which I suppose you could call CatchUp.
Follow Home > OnDemand > Music, News & Sport > Sport > Sky Sports.
Be aware there's no HD content in there, that was removed a couple of years back. I'd like to think it'll return someday.