diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index db1cc110..5aa77e2c 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -5,3 +5,4 @@
 | yaswant         | Yaswant Pradhan  | Met Office  | 2026-06-30 |
 | doucla          | Douglas Clark    | UKCEH       | 2026-07-03 |
 | james-bruten-mo | James Bruten     | Met Office  | 2026-07-09 |
+| ppharris        | Phil Harris      | UKCEH       | 2026-09-03 |
diff --git a/src/io/model_interface/model_interface_mod.F90 b/src/io/model_interface/model_interface_mod.F90
index b06b80a8..f9e42fb9 100644
--- a/src/io/model_interface/model_interface_mod.F90
+++ b/src/io/model_interface/model_interface_mod.F90
@@ -176,7 +176,7 @@ MODULE model_interface_mod
 ! Array holding the metadata for all model variables that we can use for input
 ! or output. The CABLE land surface model adds 10 prognostics for tiled
 ! soil/snow prognostics.
-INTEGER, PARAMETER :: n_vars = 723
+INTEGER, PARAMETER :: n_vars = 724
 TYPE(var_metadata) :: metadata(n_vars)
 
 ! Include the metadata DATA statement
diff --git a/src/io/model_interface/variable_metadata.inc b/src/io/model_interface/variable_metadata.inc
index 8b7fa44c..64117dd5 100644
--- a/src/io/model_interface/variable_metadata.inc
+++ b/src/io/model_interface/variable_metadata.inc
@@ -6990,7 +6990,7 @@ DATA metadata(542) / var_metadata(                                             &
 ! String identifier
     'apar',                                                                    &
 ! Variable type
-    var_type_surface,                                                          &
+    var_type_pft,                                                              &
 ! Long name
     "PFT Absorbed Photosynthetically Active Radiation",                        &
 ! Units
@@ -9367,4 +9367,17 @@ DATA metadata(723) / var_metadata(                                             &
 ! Units
     "kg m-2 s-1"                                                               &
   ) /
+!-----------------------------------------------------------------------------
+! Metadata for nbp_gb
+!-----------------------------------------------------------------------------
+DATA metadata(724) / var_metadata(                                             &
+! String identifier
+    'nbp_gb',                                                                  &
+! Variable type
+    var_type_surface,                                                          &
+! Long name
+    "Gridbox net biosphere productivity",                                      &
+! Units
+    "kg/m2/360 days"                                                           &
+  ) /
 #endif