Forsythia (digging out)

I have a very old woody Forsythia which currently forms part of a hedge (East facing) that I intend to remove. Can anyone tell me the best way to go about it. I have cut it down to about 60cm. A lot of it was rotten at the bottom and just broke off. Does it have a deep root system? I am thinking of replacing it with a Photinia Red Robin, just for the contrast in colour. Thanks
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In the sticks near Peterborough