So I got this to work...sort of. Here's what I ended up doing before I abandoned the effort. It took about 2 minutes to go through all 15 sheets with the calculation and screen updating turned off. As a result, I ended up removing all dollar signs and all pound signs then added a cell to the top of each sheet that stated what currency was being used.
Sheets(("Cash Flow Summary")).Select
Range("A1").Select
On Error Resume Next
Application.FindFormat.Clear
Application.ReplaceFormat.Clear
Application.FindFormat.NumberFormat = "[$$-409]#,##0"
Application.ReplaceFormat.NumberFormat = "[$£-809]#,##0"
Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchOrder:= _
xlByRows, MatchCase:=False, SearchFormat:=True, ReplaceFormat:=True
Application.FindFormat.Clear
Application.ReplaceFormat.Clear
Application.FindFormat.NumberFormat = "[$$-409]#,##0.00"
Application.ReplaceFormat.NumberFormat = "[$£-809]#,##0.00"
Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchOrder:= _
xlByRows, MatchCase:=False, SearchFormat:=True, ReplaceFormat:=True
Application.FindFormat.Clear
Application.ReplaceFormat.Clear
Application.FindFormat.NumberFormat = "_($* #,##0.00_);_($* (#,##0.00);_($* ""-""??_);_(@_)"
Application.ReplaceFormat.NumberFormat = "[$£-809]#,##0"
Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchOrder:= _
xlByRows, MatchCase:=False, SearchFormat:=True, ReplaceFormat:=True
Application.FindFormat.Clear
Application.ReplaceFormat.Clear
Application.FindFormat.NumberFormat = "$#,##0"
Application.ReplaceFormat.NumberFormat = "[$£-809]#,##0"
Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchOrder:= _
xlByRows, MatchCase:=False, SearchFormat:=True, ReplaceFormat:=True
Application.FindFormat.Clear
Application.FindFormat.NumberFormat = "$#,##0.00"
Application.ReplaceFormat.Clear
Application.ReplaceFormat.NumberFormat = "[$£-809]#,##0.00"
Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchOrder:= _
xlByRows, MatchCase:=False, SearchFormat:=True, ReplaceFormat:=True
____________________
Mike