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No sorry to say no plastic pipe can be used for a return circuit
And you might need the pump
With the pump off and a valve shut on the pump / return circuit
Leave it for a day / over night with no one running hot water
Go to the furthest outlet away from the cylinder and time the time it takes to get hot
If more than 30 seconds it needs one
And you might need the pump
With the pump off and a valve shut on the pump / return circuit
Leave it for a day / over night with no one running hot water
Go to the furthest outlet away from the cylinder and time the time it takes to get hot
If more than 30 seconds it needs one