Bird of Paradise Plant (Fiveways Brighton)

Needs rescuing asap.
I got this in December. It was waterlogged on arrival. It's also had little black flies, which could be Fungus Gnat.
I was going to repot. The plant is actually got 3 different root systems. I'd like this to go to someone that knows what they're doing.
Collection Times
During the day (anyday usually), upto 5 pm.