The usual answer to this is painting, boxing in with wooden covers or doing the same with metal ones. If painting is the preferred option then choosing a fine quality metal paint that will stand up to heat must be used.
Preparation is the key to a good job and if there is even the slightest bit of rust it should be scrubbed with a wire brush. An undercoat should be applied before the final layer is painted on.
One small irritation with paint is that the smell of new paint seems to linger for years. Every time the radiators are heated up all you can do is smell fresh paint.
A wooden box job is also a popular option and this can be finished with a handy shelf on top for books or ornaments. The good thing about this arrangement is that as the heat cannot immediately rise it is more likely to be radiated horizontally into the room.
New radiators UK are thinner skinned than old ones and are probably more efficient at radiating the heat. But hot air rises and if ceilings are high it takes time to be circulate around the room at the level you want it.
Many people with high ceilinged rooms find there is much benefit in a ceiling fan that helps blow the warm air downwards more quickly.
The third option is for metal covers. Both wooden and metal can be bought online but judging from the variety available, wood seems the more popular.
Some critics suggest that covering any radiator reduces their heat output. Others argue that whether the heat is boxed or not, the same BTU output means it will always find its way into the atmosphere.
Covered, painted or boxed the most important fact is that insulation is critical. There is no point in paying for heat if it’s just going to waste through poorly insulated glass windows.