diff --git a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
index cae86032ca..59f9fc7da8 100644
--- a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
+++ b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
@@ -350,6 +350,9 @@ public:
                 inline const typename parcelType::constantProperties&
                     constProps() const;
 
+                //- Return access to the constant properties
+                inline typename parcelType::constantProperties& constProps();
+
                     //- Return reference to the sub-models dictionary
                 inline const dictionary& subModelProperties() const;
 
diff --git a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloudI.H b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloudI.H
index bef2f78a60..5ba48458f2 100644
--- a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloudI.H
+++ b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloudI.H
@@ -89,6 +89,14 @@ Foam::KinematicCloud<CloudType>::constProps() const
 }
 
 
+template<class CloudType>
+inline typename CloudType::particleType::constantProperties&
+Foam::KinematicCloud<CloudType>::constProps()
+{
+    return constProps_;
+}
+
+
 template<class CloudType>
 inline const Foam::dictionary&
 Foam::KinematicCloud<CloudType>::subModelProperties() const
diff --git a/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloud.H b/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloud.H
index 2797250cc3..ed7d0202cb 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloud.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloud.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -206,6 +206,9 @@ public:
             inline const typename parcelType::constantProperties&
                 constProps() const;
 
+            //- Return access to the constant properties
+            inline typename parcelType::constantProperties& constProps();
+
 
             // Sub-models
 
diff --git a/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloudI.H b/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloudI.H
index a5d5fc1e45..7abbc9f54a 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloudI.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ReactingCloud/ReactingCloudI.H
@@ -41,6 +41,14 @@ Foam::ReactingCloud<CloudType>::constProps() const
 }
 
 
+template<class CloudType>
+inline typename CloudType::particleType::constantProperties&
+Foam::ReactingCloud<CloudType>::constProps()
+{
+    return constProps_;
+}
+
+
 template<class CloudType>
 inline const Foam::CompositionModel<Foam::ReactingCloud<CloudType> >&
 Foam::ReactingCloud<CloudType>::composition() const
diff --git a/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloud.H b/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloud.H
index bb72273e3f..de157da343 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloud.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloud.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -211,6 +211,9 @@ public:
             inline const typename parcelType::constantProperties&
                 constProps() const;
 
+            //- Return access to the constant properties
+            inline typename parcelType::constantProperties& constProps();
+
 
             // Sub-models
 
diff --git a/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloudI.H b/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloudI.H
index e4cef9783b..c7aa0e4aaf 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloudI.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ReactingMultiphaseCloud/ReactingMultiphaseCloudI.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -41,6 +41,14 @@ Foam::ReactingMultiphaseCloud<CloudType>::constProps() const
 }
 
 
+template<class CloudType>
+inline typename CloudType::particleType::constantProperties&
+Foam::ReactingMultiphaseCloud<CloudType>::constProps()
+{
+    return constProps_;
+}
+
+
 template<class CloudType>
 inline const Foam::DevolatilisationModel
 <
diff --git a/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloud.H b/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloud.H
index d746141aea..4f858d6643 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloud.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloud.H
@@ -225,6 +225,9 @@ public:
             inline const typename parcelType::constantProperties&
                 constProps() const;
 
+            //- Return access to the constant properties
+            inline typename parcelType::constantProperties& constProps();
+
             //- Return const access to thermo package
             inline const SLGThermo& thermo() const;
 
diff --git a/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloudI.H b/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloudI.H
index 80288cb52c..ea1b79f194 100644
--- a/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloudI.H
+++ b/src/lagrangian/intermediate/clouds/Templates/ThermoCloud/ThermoCloudI.H
@@ -45,6 +45,14 @@ Foam::ThermoCloud<CloudType>::constProps() const
 }
 
 
+template<class CloudType>
+inline typename CloudType::particleType::constantProperties&
+Foam::ThermoCloud<CloudType>::constProps()
+{
+    return constProps_;
+}
+
+
 template<class CloudType>
 inline const Foam::SLGThermo& Foam::ThermoCloud<CloudType>::thermo() const
 {