For those of you who buy perennials in packs from Wilkinsons.
All of my plants had roots tied together using white rubber bands which I initially missed until I got them out of their pot to check what looked like eggs in the soil a week later. I found the rubber bands were not easy to spot at they're the same colour as the roots.
Removal of the rubber band let's free a lovely and generous root system.
I'm sure most people aren't as dopey as me but I'm putting it on here just in case.