Parking at Exhibition Centre Liverpool

[Ontheup75]

We're going to the British Gymnastics Championships on Sunday 26th March.
The website says the King's Dock Car Park is onsite.
What is the likelihood of this being full?
Do I need a plan b parking further away?
I've seen various pre-book websites but reviews aren't always good.
Suggestions appreciated!
Thanks!

It will fill up quickly, if you don't mind a short walk there is a q-park next to John Lewis in Liverpool one, around a 5 minute walk to the arena.

@bunintheoven88 thank you!
We'd be getting there around 10am on the Sunday.
Do you think just pre book the q park, or have that as a plan be if the main one is full?