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DIY query

I speak with some authority on this as I used to own a property with approx 30 radiators. You won't need to flush the system.
You will need to bleed and balance the system.

Turn every radiator off at the inlet valve. Turn heating on.
Start at the radiator nearest the boiler and open the inlet valve slighly until it gets hot. If it doesn't open the bleed screw to release air.

Do this for every radiator, opening the inlet valve slightly more the further away from the boiler.
 

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