the side of the radiator that the lockshield valve is on gets hot ( the right hand side) the thermostat side pipe stays cold are the valves on the wrong way.
Many valves are bi-directional, so it doesn't matter which end of the radiator they are fitted to, or the direction the water flows through them.
They are usually marked with a double headed arrow on the valve body to show the flow can be in either direction.
Some are uni-directional. they are usually marked with a single arrow. Again they can be fitted on either end of a radiator, but the arrow should point in the direction of the water flow.
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