Buddleja renovation

Hi there, can I cut these larger Buddleja trunks right to the base? I've lopped the front smaller section down to the usual 30cm, but was wondering if I can just start again with the trunks or are they too old and gnarly? Seem solid. They have growth coming up, so...

 

Yep you can MAJ
Cut those old and gnarly trunks to the ground. Now is a good time.
You will see new shoots very quickly to produce a rejuvenated bush

 

Thanks @Verdun!