TRV valves on radiators

All the radiators in my house are pretty old, they dont have any of these dials on them:

Straight-trv-image-for-box.jpg

^ Are these TRV valves? If so, does that relate to the heat indicator etc, or what exactly makes up a TRV ?

Should all my radiators have this function added on to them?

Or should all my radiators be upgraded to modern ones?

They all work, but just want to modernise the house a little throughout.
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