Virgin TV Box connector

Hello,

We have a virgin TV box and WiFi set up that an engineer did for us about a year ago that all worked fine. 

We recently renovated the room where the cable entered the house so disconnected the TV box and put it into storage.

I've gone to reconnect the TV box to the splitter but can't for the life of me get the coaxial to fit into the TV box, its as if I'm missing a part? The connection i have is screw fit whilst the TV box appears to be push fit. The WiFi is screw fit and all okay.

Please can someone help by telling me the right connector I need? Im happy to buy it if I've lost it but have no idea on the right one to buy. Thanks