and why does this script make it happen please

Sub MergeMove()
'
' MergeMove Macro

'
With ActiveSheet
xlastrow = .Cells(Rows.Count, 2).End(xlUp).Row
For x = 1 To xlastrow
.Cells(x, 15) = .Cells(x, 8) & " " & .Cells(x, 9) & " "
Next x
End With
'
Columns("O:O").Select
Selection.Copy
Columns("H:H").Select
Selection.PasteSpecial Paste:=xlValues, Operation:=xlNone
SkipBlanks:= _
False, Transpose:=False
Columns("I:I").Select
Application.CutCopyMode = False
Selection.Delete Shift:=xlToLeft
Columns("N:N").Select
Selection.Delete Shift:=xlToLeft
Range("H1").Select
ActiveCell.FormulaR1C1 = "Address Ln.1"
Range("H2").Select
'

Columns("G:G").Select
Selection.NumberFormat = "yyyy-mm-dd"
Columns("D:D").Select
Selection.Replace What:="", Replacement:="N/A", LookAt:=xlPart, _
SearchOrder:=xlByRows, MatchCase:=False
Columns("H:H").Select
Selection.Replace What:="", Replacement:="N/A", LookAt:=xlPart, _
SearchOrder:=xlByRows, MatchCase:=False
Columns("I:I").Select
Selection.Replace What:="", Replacement:="N/A", LookAt:=xlPart, _
SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="ns_no", Replacement:="NS No.", LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="surname", Replacement:="Surname", LookAt:
_
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="forename1", Replacement:="Forename 1"
LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="forename2", Replacement:="Forename 2"
LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="title", Replacement:="Title", LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="sex", Replacement:="Sex", LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="dob", Replacement:="DOB", LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="house_no", Replacement:="Address Ln.1"
LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="road_name", Replacement:="Address Ln.2"
LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="town_name", Replacement:="Town", LookAt:
_
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Rows("1:1").Select
Selection.Replace What:="postcode", Replacement:="Post Code"
LookAt:= _
xlPart, SearchOrder:=xlByRows, MatchCase:=False
Columns("M:M").Select
With Selection.Validation
.Delete
.Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop
Operator:= _
xlBetween, Formula1:="N/A,P,L,D"
.IgnoreBlank = True
.InCellDropdown = True
.InputTitle = ""
.ErrorTitle = ""
.InputMessage = "P=Newly found" & Chr(10) & "L=Left" & Chr(10
& "D=Died"
.ErrorMessage = ""
.ShowInput = True
.ShowError = True
End With
Range("L1").Select
ActiveCell.FormulaR1C1 = "PCode"
Range("M1").Select
ActiveCell.FormulaR1C1 = "Registration Details"
Cells.Select
Selection.Columns.AutoFit
With Selection
.HorizontalAlignment = xlGeneral
.VerticalAlignment = xlBottom
.WrapText = False
.Orientation = 0
.AddIndent = False
.ShrinkToFit = False
.MergeCells = False
End With
With Selection
.HorizontalAlignment = xlCenter
.VerticalAlignment = xlBottom
.WrapText = False
.Orientation = 0
.AddIndent = False
.ShrinkToFit = False
.MergeCells = False
End With
With Selection.Font
.Name = "Arial"
.Size = 8
.Strikethrough = False
.Superscript = False
.Subscript = False
.OutlineFont = False
.Shadow = False
.Underline = xlUnderlineStyleNone
.ColorIndex = xlAutomatic
End With
With Selection.Font
.Name = "Arial"
.Size = 8
.Strikethrough = False
.Superscript = False
.Subscript = False
.OutlineFont = False
.Shadow = False
.Underline = xlUnderlineStyleNone
.ColorIndex = xlAutomatic
End With
Rows("1:1").Select
With Selection
.HorizontalAlignment = xlCenter
.VerticalAlignment = xlTop
.WrapText = False
.Orientation = 0
.AddIndent = False
.ShrinkToFit = False
.MergeCells = False
End With
ActiveWindow.SmallScroll ToRight:=3
Range("M1").Select
Columns("M:M").ColumnWidth = 9.86
Columns("M:M").ColumnWidth = 10.86
With Selection
.HorizontalAlignment = xlCenter
.VerticalAlignment = xlTop
.WrapText = True
.Orientation = 0
.AddIndent = False
.ShrinkToFit = False
.MergeCells = False
End With
Columns("L:L").Select
Selection.Replace What:="", Replacement:="N8???", LookAt:=xlPart,
_
SearchOrder:=xlByRows, MatchCase:=False
Range("A1").Select
Columns("O:O").Select
Selection.Copy
Columns("H:H").Select
Selection.PasteSpecial Paste:=xlValues, Operation:=xlNone,
SkipBlanks:= _
False, Transpose:=False
Columns("I:I").Select
Application.CutCopyMode = False
Selection.Delete Shift:=xlToLeft
Columns("N:N").Select
Selection.Delete Shift:=xlToLeft
Range("H1").Select
ActiveCell.FormulaR1C1 = "Address Ln.1"
Range("H2").Select
End Sub


--
Steve M
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