diff --git a/Export-Excel.ps1 b/Export-Excel.ps1
index 713b065..94db447 100644
--- a/Export-Excel.ps1
+++ b/Export-Excel.ps1
@@ -498,7 +498,7 @@
                     $TargetCell.Value = $_
                     $TargetCell.Style.Numberformat.Format = '[h]:mm:ss'
                     break
-                } 
+                }
                 { $_ -is [System.ValueType]} {
                     # Save numerics, setting format if need be.
                     $TargetCell.Value = $_
@@ -641,7 +641,7 @@
                     #Otherwise the default will be unbolded.
                     $ws.Cells[$Row, $StartColumn].Style.Font.Bold = $True
                 }
-                if ($TitleBackgroundColor ) {  
+                if ($TitleBackgroundColor ) {
                     $ws.Cells[$Row, $StartColumn].Style.Fill.PatternType = $TitleFillPattern
                     $ws.Cells[$Row, $StartColumn].Style.Fill.BackgroundColor.SetColor($TitleBackgroundColor)
                 }
@@ -650,7 +650,11 @@
             else {  $Row = $StartRow }
             $ColumnIndex = $StartColumn
             $Numberformat = Expand-NumberFormat -NumberFormat $Numberformat
-            $setNumformat = ($Numberformat -ne $ws.Cells.Style.Numberformat.Format)
+            if ($row -le 2 -and $ColumnIndex -eq 1 -and $Numberformat -ne $ws.Cells.Style.Numberformat.Format) {
+                    $ws.Cells.Style.Numberformat.Format = $Numberformat
+                    $setNumformat = $false
+            }
+            else {  $setNumformat = ($Numberformat -ne $ws.Cells.Style.Numberformat.Format) }
 
             $firstTimeThru = $true
             $isDataTypeValueType = $false
@@ -671,7 +675,7 @@
             Try {
                 if ($firstTimeThru) {
                     $firstTimeThru = $false
-                    $isDataTypeValueType = $TargetData.GetType().name -match 'string|datetime|bool|byte|char|decimal|double|float|int|long|sbyte|short|uint|ulong|ushort'
+                    $isDataTypeValueType = $TargetData.GetType().name -match 'string|timespan|datetime|bool|byte|char|decimal|double|float|int|long|sbyte|short|uint|ulong|ushort'
                     if ($isDataTypeValueType) {$row -= 1} #row incremented before adding values, so it is set to the number of rows inserted at the end
                     Write-Debug "DataTypeName is '$($TargetData.GetType().name)' isDataTypeValueType '$isDataTypeValueType'"
                 }
diff --git a/README.md b/README.md
index fb4d800..11ef54f 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,8 @@ Install-Module ImportExcel -scope CurrentUser
 ```PowerShell
 Install-Module ImportExcel
 ```
-# New to Aug 14th
+# New to Aug 15h
+- NumberFormat in Export-Excel now sets the default for on a new / blank sheet; but [still] sets individual cells when adding to a sheet
 - Added support for timespans in Export excel ; set as elapsed hours, mins, secs [h]:mm:sss
 - In Export-Excel improved the catch-all handler for insering values to cope better with nested objects (#419) and reduce the number of parse operations 
 - Added -Calculate switch to Export-Excel and Close-Excel Package; EPPlus needs formulas to OMIT the leading = sign so where formula is set it now strips a leading = sign
diff --git a/__tests__/Export-Excel.Tests.ps1 b/__tests__/Export-Excel.Tests.ps1
index a9c75f0..9abb0c5 100644
--- a/__tests__/Export-Excel.Tests.ps1
+++ b/__tests__/Export-Excel.Tests.ps1
@@ -143,6 +143,27 @@ Describe ExportExcel {
         }
     }
 
+    Context "                # Number format parameter" {
+        BeforeAll {
+            $path = "$env:temp\test.xlsx"
+            Remove-Item -Path  $path -ErrorAction SilentlyContinue
+            1..10  | Export-Excel -Path $path -Numberformat 'Number'                                                                                                                                     
+            1..10  | Export-Excel -Path $path -Numberformat 'Percentage' -Append                                                                                                                          
+            21..30 | Export-Excel -Path $path -Numberformat 'Currency' -StartColumn 3
+            $excel = Open-ExcelPackage -Path   $path   
+            $ws = $excel.Workbook.Worksheets[1] 
+        }
+        it "Set the worksheet default number format correctly                                      " { 
+            $ws.Cells.Style.Numberformat.Format                         | Should     be "0.00"
+        }
+        it "Set number formats on specific blocks of cells w                                       " {
+            $ws.Cells["A2" ].Style.Numberformat.Format                  | Should     be "0.00"
+            $ws.Cells["c19"].Style.Numberformat.Format                  | Should     be "0.00"
+            $ws.Cells["A19"].Style.Numberformat.Format                  | Should     be "0.00%"
+            $ws.Cells["C6" ].Style.Numberformat.Format                  | Should     be (Expand-NumberFormat "currency")
+        }
+    }
+
     Context "#Examples 3 & 4 # Setting cells for different data types Also added test for URI type" {
 
         if ((Get-Culture).NumberFormat.CurrencySymbol -eq "£") {$OtherCurrencySymbol = "$"}