Hi,EvolutionGaming! Basically i would recommend you to take a look at ContentExamples from Epics,and there is and example of Replicated variables in your case its a float HealthVar(The map called Networking).The Widgets are not replicated in the Networking pipeline(why you ask yourself and me),cause another player don’t need any info about the other player widget(UI).So basically you should only replicate one variable called Health and show on clients this values.
I also attach the document with the presentation which describes a very good explanation how to replicate.We this understanding you will have no problems with your issue.link text