Create totals table from multiple tables

Huge thanks to Phillip Seamark who came up with an awesome solution whilst waiting to board a plane:-

Totals = 

Var MyVisits = SUMMARIZECOLUMNS(
                    sem[Country SEM],
                    "Total Active Visits SEM",SUM('sem'[Active Visits SEM]),
                    "Total Clicks SEM" , SUM('sem'[Clicks SEM]),
					"Total Referrals SEM" , SUM('sem'[Referrals SEM]),
					"Total Spend SEM" , SUM('sem'[Spend])
                    )
var myDisplay = SUMMARIZECOLUMNS(
                    'display'[Country DISP],
                    "Total Impressions",SUM('display'[Impressions]),
					"Total Active Visits DISP",SUM('display'[Active Visits DISP]),
					"Total Clicks DISP" , SUM('display'[Clicks DISP]),
					"Total Referrals DISP" , SUM('display'[Referrals DISP]),
					"Total Spend DISP" , SUM('display'[Spend])
                    )      
        
var FirstTable = NATURALLEFTOUTERJOIN(
            SELECTCOLUMNS(countries,"Country",[country] & ""),
            SELECTCOLUMNS(myDisplay,"Country",[Country DISP] & "" , 
                "Total Impressions" ,[Total Impressions] & "" , 
				"Total Clicks DISP" ,[Total Clicks DISP]& "" , 
				"Total Referrals DISP" ,[Total Referrals DISP]& "" ,
				"Total Active Visits DISP" ,[Total Active Visits DISP]& "" , 
				"Total Spend DISP" ,[Total Spend DISP]
            )
            )
            
            
var FinalTable = NATURALLEFTOUTERJOIN(
            FirstTable,
            SELECTCOLUMNS(
                MyVisits,
                "Country",[Country SEM] & "",
                "Total Active Visits SEM",[Total Active Visits SEM],
				"Total Referrals SEM",[Total Referrals SEM],
				"Total Spend SEM",[Total Spend SEM],
                "Total Clicks SEM" , [Total Clicks SEM]))            
return FinalTable