Pruning a Photinia Fraseri ‘Red Robin’

About a year ago I planted 4 x red robins for a screening hedge, 3 are 6’ now, but one doesn’t seem to have grown much vertically. It has had more shade than the others with branches of a rose bush in amongst it.
What kind of cuts to make as the best way to encourage more upright growth and height with this plant?
What kind of cuts to make as the best way to encourage more upright growth and height with this plant?
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks folks, come Spring i'll cut some rose baco to give some room to the photinia. I don't want to do that now though as it's my screen between our front windows and the street!