Forgive me being a complete moron this morning, here's the code I'm using to open the source file and the presentation as well as to close both again. I've tried a variety of ideas to force the update of the presentation but so far nothing 

Sub DAILY_STATS_PRESENTATION()
Dim oPPTPres As Object
Dim OPPTShape As Object
Dim oPPTAPP As Object

Workbooks.Open Filename:="FILEPATH\Daily Performance Slides.xlsm", UpdateLinks:=True

Set oPPTAPP = CreateObject("Powerpoint.application")
oPPTAPP.Visible = True
Set oPPTPres = oPPTAPP.Presentations.Open("FILEPATH\Daily Performance.pptm")

'oPPTPres.Close
'Set oPPTPres = Nothing
'oPPTAPP.Quit
'Set oPPTAPP = Nothing

End Sub
IDEAS ATTEMPTED
1. oPPTPres.updatelinks     'Doesn't cause an error, but doesn't appear to update the presentation)
2. Set oPPTPres = oPPTAPP.Presentations.UpdateLinks("PATH\Daily Performance.pptm") 'Causes an error
3. Set oPPTPres = oPPTAPP.Presentations.Open("S:\Contact Centre Analyst\ADHOC REPORTS\Daily Performance.pptm" UpdateLinks:=True)  'Causes an error too