diff --git a/Code/Mantid/instrument/INTER_Parameters.xml b/Code/Mantid/instrument/INTER_Parameters.xml
index 21c2c5aba9133887abfb0fc879a0f29986b259e0..7c31ea1ef197d414925a80d25603df169e41771e 100644
--- a/Code/Mantid/instrument/INTER_Parameters.xml
+++ b/Code/Mantid/instrument/INTER_Parameters.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<parameter-file instrument = "INTER" valid-from = "2014-01-13T00:00:00">
+<parameter-file instrument = "INTER" valid-from = "2012-01-31T00:00:00">
 <component-link name = "INTER">
   <parameter name="MonitorIntegralMin">
     <value val="4.0"/>
diff --git a/Code/Mantid/instrument/SURF_Parameters.xml b/Code/Mantid/instrument/SURF_Parameters.xml
index 8a21045fd5a8beaba5daf6879ea76dee74a70ca9..5bcbb2e47851324dbb29575993f60964f3e08613 100644
--- a/Code/Mantid/instrument/SURF_Parameters.xml
+++ b/Code/Mantid/instrument/SURF_Parameters.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<parameter-file instrument = "SURF" valid-from = "2014-01-13T00:00:00">
+<parameter-file instrument = "SURF" valid-from = "2012-01-31T00:00:00">
 <component-link name = "SURF">
   <parameter name="MonitorIntegralMin">
     <value val="4.0"/>