Network connections stop working when upgrading to Cordova ios 4.5.4

Hello everyone.

I’m upgrading a v1 app which we’ve had for a year to IOS11/iPhone X and have run into a problem with the network connection to the remote server stop working. The last time we published an update in August everything worked fine. I followed the instructions on the iOS 11 checklist but there’s nothing mentioned specifically about networking being an issue and after a lot of searching I can’t find any recommendations.

Is there anything new for iOS11/Cordova4 that I need to add into config.xml or the index.html meta tags to allow networking?

Any help gratefully received.

My setup is as follows

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.18.0
ionic (Ionic CLI) : 3.18.0

global packages:

cordova (Cordova CLI) : 7.1.0 

local packages:

Cordova Platforms : ios 4.5.4
Ionic Framework   : ionic1 1.3.2


ios-deploy : 1.9.1 
ios-sim    : 5.0.8 
Node       : v9.2.0
npm        : 5.5.1 
OS         : macOS Sierra
Xcode      : Xcode 9.1 Build version 9B55