Warm radiators whole house

[Donald welsh]

Hi all
Just had a radiator added to system since the radiators are warm. Would the position of the T in to current system have an effect have attached diagram of pipework. Advice would be welcome.
Were the red is missing sellotape over before adding colour

 

[cross thread]

the hot water return should be the last tee on the return pipe

 

[Donald welsh]

If I'm correct In saying the return on the new radiator has to be taken out and moved behind the T in for return to boiler and cylinder.