diff --git a/Testing/SystemTests/tests/analysis/ISIS_PowderPearlTest.py b/Testing/SystemTests/tests/analysis/ISIS_PowderPearlTest.py
index c162b44bf8c0383cbb8473e36c9517416c262ec4..d645319580e4c805588e7fd553a054fb3be2db3d 100644
--- a/Testing/SystemTests/tests/analysis/ISIS_PowderPearlTest.py
+++ b/Testing/SystemTests/tests/analysis/ISIS_PowderPearlTest.py
@@ -3,7 +3,6 @@ from __future__ import (absolute_import, division, print_function)
 import os
 import stresstesting
 
-import mantid.simpleapi as mantid
 from mantid import config
 
 from isis_powder.pearl import Pearl
@@ -95,4 +94,3 @@ def _setup_pearl_instrument(tt_mode):
                       calibration_directory=_get_calibration_dir(), output_directory=_get_output_dir(),
                       calibration_config_path=calibration_map_file_path)
     return pearl_obj
-
diff --git a/scripts/Diffraction/isis_powder/abstract_inst.py b/scripts/Diffraction/isis_powder/abstract_inst.py
index 380fe71341b27bb4ed5d255dd02bcd7481d2f54d..91bc70c66e4fc1ceba7bcca13d82888937c58925 100644
--- a/scripts/Diffraction/isis_powder/abstract_inst.py
+++ b/scripts/Diffraction/isis_powder/abstract_inst.py
@@ -5,7 +5,7 @@ from abc import ABCMeta, abstractmethod
 
 from six import add_metaclass
 
-from isis_powder.routines import calibrate, focus, common
+from isis_powder.routines import calibrate, focus
 
 
 # This class provides common hooks for instruments to override
@@ -104,8 +104,6 @@ class AbstractInst(object):
         return None
 
     # Optional overrides
-
-
     @abstractmethod
     def apply_absorb_corrections(self, run_details, van_ws, gen_absorb=False):
         """
diff --git a/scripts/Diffraction/isis_powder/pearl_routines/pearl_algs.py b/scripts/Diffraction/isis_powder/pearl_routines/pearl_algs.py
index 3e5219fe13c2ffbbfd5fe78a492b50bb9d7d5ef6..34899454d3dc5a496566a38ea9b2d47c2e6ed6ef 100644
--- a/scripts/Diffraction/isis_powder/pearl_routines/pearl_algs.py
+++ b/scripts/Diffraction/isis_powder/pearl_routines/pearl_algs.py
@@ -44,6 +44,7 @@ def generate_vanadium_absorb_corrections(van_ws):
     mantid.CreateSampleShape(InputWorkspace=shape_ws, ShapeXML='<sphere id="sphere_1"> <centre x="0" y="0" z= "0" />\
                                                       <radius val="0.005" /> </sphere>')
 
+    calibration_full_paths = None
     absorb_ws = \
         mantid.AbsorptionCorrection(InputWorkspace=shape_ws, AttenuationXSection="5.08",
                                     ScatteringXSection="5.1", SampleNumberDensity="0.072",
diff --git a/scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py b/scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py
index e859af6fa82caa2bf3cbe0e1432b43cff9fccc0d..3d6fcafc4dc5fd8e2ba3e262ca16cdc5881ecfbf 100644
--- a/scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py
+++ b/scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py
@@ -3,7 +3,6 @@ from __future__ import (absolute_import, division, print_function)
 import mantid.simpleapi as mantid
 import os
 from isis_powder.routines import common, yaml_parser
-from isis_powder.routines.common_enums import InputBatchingEnum
 from isis_powder.routines.RunDetails import RunDetails
 from isis_powder.polaris_routines import polaris_advanced_config
 
diff --git a/scripts/Diffraction/isis_powder/routines/RunDetails.py b/scripts/Diffraction/isis_powder/routines/RunDetails.py
index a66f4dc2c0d1ed01d252c35a728b2d3054f66380..bc674c8e84e91af5792510353ea507209a037526 100644
--- a/scripts/Diffraction/isis_powder/routines/RunDetails.py
+++ b/scripts/Diffraction/isis_powder/routines/RunDetails.py
@@ -19,4 +19,3 @@ class RunDetails(object):
         self.splined_vanadium_file_path = None
         self.vanadium_absorption_path = None
         self.vanadium_run_numbers = None
-
diff --git a/scripts/Diffraction/isis_powder/routines/yaml_parser.py b/scripts/Diffraction/isis_powder/routines/yaml_parser.py
index dc3f9bda270d7c85205b6cf49788e589f86a3b20..78c79f4b877f34ab57cbd9c8e9630e9a45717ed7 100644
--- a/scripts/Diffraction/isis_powder/routines/yaml_parser.py
+++ b/scripts/Diffraction/isis_powder/routines/yaml_parser.py
@@ -1,7 +1,6 @@
 from __future__ import (absolute_import, division, print_function)
 
 import os
-import warnings
 import yaml
 from isis_powder.routines import common as common
 from isis_powder.routines import yaml_sanity