Let them self seed, you may find a new variety pops up in your garden
Only a couple of miles away from me, I don't go there much though
Verdun is Perennials of Distinction based at Rougham Hall Nurseries in Suffolk.
If you look on Google there are several videos on how to remove them with a strong cable attached to a 4x4
J parkers are very good for bulbs but not plants
Wyevale have them
You need to take the shoots off the sweet potato when they are long enough & root them as cuttings , I don't think you can actually plant the tuber.
Yes they will become very leggy if kept inside, still too early for planting annual seeds unless you have a frost free greenhouse to keep them in.
I'm fitting my own, even better value
As long as frost is not forecast you can cut it at any time