diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index 07c241d0..8e651665 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -637,6 +637,36 @@ def make_path(MyVar):
     path += MyVar['name']
     return path
 
+def generate_filename(MyDriver):
+    global args
+    old_name = "sct_%s.tcl" % MyDriver['name']
+    new_name = "%s_sct.tcl" % MyDriver['name']
+    if 'PathName' in MyDriver:
+        full_old_name = os.path.join(MyDriver['PathName'], old_name)
+        full_new_name = os.path.join(MyDriver['PathName'], new_name)
+    else:
+        full_old_name = old_name
+        full_new_name = new_name
+
+    # This block of code generates shell commands to help the old->new rename
+    if Move:
+        fd = open("git_mv.sh", "a")
+        fd.write( "git mv " + full_old_name + " " + full_new_name + "\n")
+        fd.close()
+        fd = open("grep_sed.sh", "a")
+        fd.write( "for f in $(grep " + old_name + " instrument -Irl" + "); do\n")
+        fd.write( "  echo ${f}\n")
+        fd.write( "  sed -i ${f} -e 's/" + old_name + "/" + new_name + "/'\n")
+        fd.write( "done\n")
+        fd.close()
+
+    if args.sct == "before":
+        MyDriver['filename'] = old_name
+        MyDriver['fullname'] = full_old_name
+    else:
+        MyDriver['filename'] = new_name
+        MyDriver['fullname'] = full_new_name
+
 def parse_args(arg_str):
     '''
     Parse the TCL argument string into a list of identifiers (in order) plus
@@ -1714,8 +1744,8 @@ def put_postamble(MyDriver):
     txt += [line]
     txt += ['}']
     txt += ['']
-    txt += ['clientput "file evaluation of sct_%s.tcl"' % MyDriver['name']]
-    txt += ['%s::sics_log 9 "file evaluation of sct_%s.tcl"' % (MyDriver['namespace'], MyDriver['name'])]
+    txt += ['clientput "file evaluation of %s"' % MyDriver['filename']]
+    txt += ['%s::sics_log 9 "file evaluation of %s"' % (MyDriver['namespace'], MyDriver['filename'])]
     emit(txt)
 
 def put_read_config(MyDriver):
@@ -1897,16 +1927,8 @@ def generate_driver(MyDriver):
     global NumberOfLinesOut
     global fdo
     NumberOfLinesOut = 0
-    old_name = "sct_%s.tcl" % MyDriver['name']
-    new_name = "%s_sct.tcl" % MyDriver['name']
-    if 'PathName' in MyDriver:
-        full_old_name = os.path.join(MyDriver['PathName'], old_name)
-        full_new_name = os.path.join(MyDriver['PathName'], new_name)
-    else:
-        full_old_name = old_name
-        full_new_name = new_name
-    fdo = open(full_new_name, 'w')
-    MyDriver['filename'] = new_name
+    generate_filename(MyDriver)
+    fdo = open(MyDriver['fullname'], 'w')
     put_preamble(MyDriver)
     put_standard_code(MyDriver)
     put_mkDriver(MyDriver)
@@ -1924,17 +1946,6 @@ def generate_driver(MyDriver):
     if Verbose:
         print "Produced file %s with %d lines." % \
                 ( MyDriver['filename'], NumberOfLinesOut)
-    # This block of code generates shell commands to help the old->new rename
-    if Move:
-        fd = open("git_mv.sh", "a")
-        fd.write( "git mv " + full_old_name + " " + full_new_name + "\n")
-        fd.close()
-        fd = open("grep_sed.sh", "a")
-        fd.write( "for f in $(grep " + old_name + " instrument -Irl" + "); do\n")
-        fd.write( "  echo ${f}\n")
-        fd.write( "  sed -i ${f} -e 's/" + old_name + "/" + new_name + "/'\n")
-        fd.write( "done\n")
-        fd.close()
 
 def process_drivers(TheDrivers):
     if Verbose:
@@ -2075,6 +2086,8 @@ def main():
         action="store_true")
     parser.add_argument("-m", "--move", help="generate move commands",
         action="store_true")
+    parser.add_argument("--sct", help="where to put the sct in the filename",
+        choices=["before", "after"], default="after")
     parser.add_argument("-v", "--verbose", help="verbose output",
         action="store_true")
     parser.add_argument("driver_source", help="driver source file", nargs="*")