TRV on flow or return - is it important?

[Rockatansky]

I've realised that some of the trv's in the house are fitted on the return side of the radiator. Some, most I think, are on the flow side - which I think is the 'correct' way to do it.

My question is; is it worth the effort to move the valves over to the other side or will I just be exposing myself to potential plumbing mishaps for no great reason?

If it makes any difference, the trv bodies are not one way and the heads are all Tado units.

[finlo]

Some makes can go either side others have a directional arrow that can still go either side but there orientation differs.

[Rockatansky]

finlo said:

Some makes can go either side others have a directional arrow that can still go either side but there orientation differs.

Thanks.

They're the type that are bidirectional so that in itself isn't an issue, it's just whether it'll make any difference to the efficiency of the operation I guess.