Your cables in image ending 702 are most likely professionally installed cables for a satellite dish feed.
The plug in image ending 809 is a standard TV coax plug, but that doesn't mean to say it's attached to a roof/loft aerial. With a back-to-back adapter, this could have connected to a socket on a Sky+/Sky+HD box to feed Sky over RF to another TV in a different part of the house.
The screw on (F-type) plug in image ending 825 is used for satellite or cable connections, but it's unlikely to be for Virgin cable. This is a screw-on fitting to the cable. Virgin's installers use compression plugs that are a permanent attachment like the Sky plug ends. This could be the connection for a masthead power supply for the TV aerial. It's common for homeowners to mistake this for a setback booster, so they take it with them when they move out.
The simplest thing to do is to go look see if you have a TV aerial on the property or in the loft. If there's a box attached to the mast or nearby in the loft then this could be a powered splitter. If so, it's possible that the single coax with the screw-on F plug is the TV aerial feed. You won't get a signal without replacing the 12V power supply and fitting a new coax lead from it to a TV.
Alternatively, your coax plug could be the TV aerial signal. Just get a telly in the room and plug it in. You won't break anything. Try tuning and see if you get reception.
If there's another room in the house with a TV coax appearing out of the wall, try the TV connection and tuning thing first. If you get a signal, great, you'll know that works. If there's nothing, then you could try shorting the centre pin to the outer ring, then take a small meter set to continuity and test whether either the coax or single F plug give you tone.
If none of this made sense, pay a professional to do the work.
Good luck.