Replacing vehicle battery 08 Symbol

Vehicle battery in 08 Symbol completely flat - was using daily until 2 weeks ago, assume was on way out and sitting still in below freezing finished it off. Can source a new battery from Halfords - was just wary that a large amount of wiring is connected to the positive side - 5 seperate wires to a cradle. Anything I should be wary off when replacing the battery with regard to onboard electronics?

Cheers

Don't think there's anything to be wary of but why not get Halfords to fit it?  Chap that done mine checked everything was working after he had finished (plus, these batteries aren't light weight items -  I fitted one in my old van and almost done myself an injury trying to lift it into position).