diff --git a/doc/example-grids/regional_variable_resolution.yml b/doc/example-grids/regional_variable_resolution.yml
new file mode 100644
index 000000000..dd84cdf75
--- /dev/null
+++ b/doc/example-grids/regional_variable_resolution.yml
@@ -0,0 +1,33 @@
+# (C) Crown copyright 2022, Met Office
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+# regional projection using variable resolution
+
+type : "regular_lonlat"
+nx : 34
+ny : 32
+projection :
+    type: "variable_resolution"
+    var_ratio : 1.13
+    delta_low : 1.
+    delta_hi : 0.6511482758621128
+    x_reg_start : 351.386944827586319
+    x_reg_end : 366.363355172413776
+    y_reg_start : -5.008754172413662
+    y_reg_end : 8.665359620690706
+    startx : 348.13120344827576
+    endx : 369.6190965517242
+    starty : -8.264495551724226
+    endy : 11.92110100000127
+    north_pole : {0.0, 90.0})
+    rim_widthx : 4
+    rim_widthy : 4
+
+check : 
+  size : 1088
+  lonlat(first) : [348.13120344827576,-8.264495551724226]
+  lonlat(last)  : [170,11.92110100000127]
+  bounding_box(n,w,s,e) : [-8.264495551724226,348.13120344827576,11.92110100000127,369.6190965517242]
+  uid : f164da5624c5335853cdb7d5754ebd1a
+
diff --git a/doc/example-grids/update_uid.py b/doc/example-grids/update_uid.py
index 125839888..3738c14a4 100755
--- a/doc/example-grids/update_uid.py
+++ b/doc/example-grids/update_uid.py
@@ -16,7 +16,8 @@ def run_program_get_error(file):
     
     from subprocess import Popen, PIPE
     
-    p = Popen(command, stdout=PIPE, stderr=PIPE)
+    #Marco Milan: add shell=True for run in linux
+    p = Popen(command, stdout=PIPE, stderr=PIPE, shell=True)
     output, error = p.communicate()
     if p.returncode != 0:
        return str(error.strip(),'ascii')
@@ -55,14 +56,21 @@ def process_file( file, newfile ):
 
 
 import sys
+print(sys.argv)
 program = sys.argv[1]
 
 print( "Updating uids of grids with program [",program,"]")
 
 import os
+
+print('file: ', __file__)
 directory = os.path.dirname(os.path.realpath(__file__))
 
+print('directory:', directory)
+
+
 for root, dirs, files in os.walk(directory):
+    print('root: ', root)
     for file in files:
         if file.endswith('.yml'):
             file = root+"/"+file