diff --git a/benchmarks/apps/hpcg/hpcg.py b/benchmarks/apps/hpcg/hpcg.py
index bb152f0c..e54b1391 100644
--- a/benchmarks/apps/hpcg/hpcg.py
+++ b/benchmarks/apps/hpcg/hpcg.py
@@ -32,9 +32,6 @@ class HPCGBenchmark(SpackTest):
     prerun_cmds.append('cp "$(dirname $(which xhpcg))/hpcg.dat" .')
 
     reference = {
-        'archer2': {
-            'flops': (1000.0, -0.2, None, 'Gflops/seconds'),
-        },
         '*': {
             'flops': (1, None, None, 'Gflops/seconds'),
         }
@@ -100,3 +97,92 @@ class HPCG_LFRic(HPCGBenchmark):
     tags = {"lfric"}
     # lfric app requires extra data - dinodump.dat
     prerun_cmds.append('cp "$(dirname $(which xhpcg))/dinodump.dat" .')
+
+
+# TODO - make a class which inherits the above, then uses spack to install oneapi mkl and so on
+# for paper on Isambard this is hard loaded below due to issues on the system (see other github issues)
+
+from reframe.core.backends import getlauncher
+from reframe.core.pipeline import RunOnlyRegressionTest
+
+class HPCGIntelOptimised_Isambard(RunOnlyRegressionTest):
+    valid_systems = ['*'] #- isambard only
+    valid_prog_environs = ['*'] # again - all hard-coded on Isambard
+    executable = './xhpcg'
+    num_cpus_per_task = 1
+    num_tasks = required
+    num_tasks_per_node = required
+    time_limit = '40m'
+    maintainers = ['dcaseGH']
+    prerun_cmds.append('module use --append /projects/bristol/modules/intel-oneapi-2023.1.0/tbb/2021.9.0/modulefiles')
+    prerun_cmds.append('module use --append /projects/bristol/modules/intel-oneapi-2023.1.0/mpi/2021.9.0/modulefiles')
+    prerun_cmds.append('module use --append /projects/bristol/modules/intel-oneapi-2023.1.0/mkl/2023.1.0/modulefiles')
+    prerun_cmds.append('module use --append /projects/bristol/modules/intel-oneapi-2023.1.0/compiler/2023.1.0/modulefiles')
+    prerun_cmds.append('module load mkl')
+    prerun_cmds.append('module load mpi')
+    prerun_cmds.append('cp /home/mox-dcase/small.dat hpcg.dat') # Strictly dont need this, but following the above lead to copy dat
+
+    @run_after('run')
+    def set_output_datafile(self):
+        # If other outputfiles in stage directory before running, ensure use latest one
+        # Assume using 104 ** 3 grid
+        possible_outfiles = glob.glob(self.stagedir + "/n104*.txt")
+        if (len(possible_outfiles) >= 1):
+            ordered_outfiles = sorted(possible_outfiles, key=lambda t: os.stat(t).st_mtime)
+            self.output_data  = ordered_outfiles[-1]
+        else:
+            self.output_data = '' #no data
+
+    @run_before('sanity')
+    def set_sanity_patterns(self):
+        # Check that it's a valid run
+        self.sanity_patterns = sn.assert_found(r'VALID with a GFLOP/s rating of=', self.output_data)
+
+    @run_before('performance')
+    def set_perf_patterns(self):
+        # This performance pattern parses the output of the program to extract
+        # the desired figure of merit.
+        self.perf_patterns = {
+            'flops': sn.extractsingle(
+                r'VALID with a GFLOP/s rating of=(\S+)',
+                self.output_data, 1, float),
+        }
+
+    @run_before('run')
+    def setup_variables(self):
+        # Strictly HPCG is only intended to run for 1 OMP thread, except in original version
+        self.env_vars['OMP_NUM_THREADS'] = f'{self.num_cpus_per_task}'
+        
+    @run_before('run')
+    def set_launcher(self):
+        self.job.launcher = getlauncher('mpiexec')()
+
+    @run_before('run')
+    def setup_num_tasks(self):
+        self.set_var_default(
+            'num_tasks',
+            self.current_partition.processor.num_cpus //
+            min(1, self.current_partition.processor.num_cpus_per_core) //
+            self.num_cpus_per_task)
+        self.set_var_default('num_tasks_per_node',
+                             self.current_partition.processor.num_cpus //
+                             self.num_cpus_per_task)
+        
+        
+@rfm.simple_test
+class HPCG_IntelAVX_Isambard(HPCGIntelOptimised_Isambard):
+    # Copy the avx exe and run it
+    tags = {"intel", "avx"}
+    prerun_cmds.append('cp /projects/bristol/modules/intel-oneapi-2023.1.0/mkl/2023.1.0/benchmarks/hpcg/bin/xhpcg_avx xhpcg')
+
+@rfm.simple_test
+class HPCG_IntelAVX2_Isambard(HPCGIntelOptimised_Isambard):
+    # Copy the avx2 exe and run it
+    tags = {"intel", "avx2"}
+    prerun_cmds.append('cp /projects/bristol/modules/intel-oneapi-2023.1.0/mkl/2023.1.0/benchmarks/hpcg/bin/xhpcg_avx2 xhpcg')
+
+@rfm.simple_test
+class HPCG_IntelSKX_Isambard(HPCGIntelOptimised_Isambard):
+    # Copy the skx exe and run it
+    tags = {"intel", "skx"}
+    prerun_cmds.append('cp /projects/bristol/modules/intel-oneapi-2023.1.0/mkl/2023.1.0/benchmarks/hpcg/bin/xhpcg_skx xhpcg')
diff --git a/benchmarks/spack/repo/packages/hpcg_excalibur/package.py b/benchmarks/spack/repo/packages/hpcg_excalibur/package.py
index 87c164a9..6799a617 100644
--- a/benchmarks/spack/repo/packages/hpcg_excalibur/package.py
+++ b/benchmarks/spack/repo/packages/hpcg_excalibur/package.py
@@ -19,8 +19,8 @@ class HpcgExcalibur(MakefilePackage):
 
     version(
         "hpcg_lfric",
-        url="https://github.com/NCAS-CMS/hpcg_27ptStencil/archive/refs/tags/lfric_250523.tar.gz",
-        sha256="fa2824890175489e5ad43e4d30d2fd41334777b4ef9c95d798536fc9b8766229"
+        url="https://github.com/NCAS-CMS/hpcg_27ptStencil/archive/refs/tags/lfric_260723.tar.gz",
+        sha256="38b042d4dcb4c6b33d01b5671f3e80c4b6b5561bed624ba98c2075c99d586c6b"
     )        
 
     version(