diff --git a/conda/recipes/mantidworkbench/meta.yaml b/conda/recipes/mantidworkbench/meta.yaml
index 41c761c69fd4..a1174bca8e87 100644
--- a/conda/recipes/mantidworkbench/meta.yaml
+++ b/conda/recipes/mantidworkbench/meta.yaml
@@ -47,6 +47,7 @@ requirements:
     {% if environ.get('INCLUDE_MANTIDDOCS', 'True') != 'False' %}
     - mantiddocs {{ version }}
     {% endif %}
+    - mslice
 
 test:
   imports:
diff --git a/mantid-developer-linux.yml b/mantid-developer-linux.yml
index 766aba429514..f704f0b89af9 100644
--- a/mantid-developer-linux.yml
+++ b/mantid-developer-linux.yml
@@ -2,6 +2,7 @@ name: mantid-developer
 
 channels:
   - conda-forge
+  - mantid
 
 dependencies:
   # Common packages
@@ -51,6 +52,7 @@ dependencies:
   - versioningit>=2.1
   - joblib
   - orsopy==1.2.1 # Fix the version to avoid updates being pulled in automatically, which might change the Reflectometry ORSO file content or layout and cause tests to fail.
+  - mslice
 
   # Not Windows, OpenGL implementation:
   - mesa-libgl-devel-cos7-x86_64>=18.3.4
diff --git a/mantid-developer-osx.yml b/mantid-developer-osx.yml
index f1cefd37a547..47509e11d13d 100644
--- a/mantid-developer-osx.yml
+++ b/mantid-developer-osx.yml
@@ -2,6 +2,7 @@ name: mantid-developer
 
 channels:
   - conda-forge
+  - mantid
 
 dependencies:
   - ccache
@@ -49,6 +50,7 @@ dependencies:
   - versioningit>=2.1
   - joblib
   - orsopy==1.2.1 # Fix the version to avoid updates being pulled in automatically, which might change the Reflectometry ORSO file content or layout and cause tests to fail.
+  - mslice
 
   # Needed only for development
   - black  # may be out of sync with pre-commit
diff --git a/mantid-developer-win.yml b/mantid-developer-win.yml
index dacc6f1e7d67..dfc50b320a41 100644
--- a/mantid-developer-win.yml
+++ b/mantid-developer-win.yml
@@ -2,6 +2,7 @@ name: mantid-developer
 
 channels:
   - conda-forge
+  - mantid
 
 dependencies:
   - ccache
@@ -48,6 +49,7 @@ dependencies:
   - versioningit>=2.1
   - joblib
   - orsopy==1.2.1 # Fix the version to avoid updates being pulled in automatically, which might change the Reflectometry ORSO file content or layout and cause tests to fail.
+  - mslice
   # Needed only for development
   - black  # may be out of sync with pre-commit
   - cppcheck==2.14.2
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 776e1e522de5..beb677d39d84 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -29,8 +29,7 @@ foreach(_dir ${_pth_dirs})
   list(APPEND _pth_list_install "${_scripts_rel_path}/${_dir}")
 endforeach()
 list(APPEND _pth_list_dev ${CMAKE_CURRENT_BINARY_DIR})
-list(APPEND _pth_list_dev ${MSLICE_DEV})
-list(APPEND _pth_list_install "${_scripts_rel_path}/ExternalInterfaces")
+# list(APPEND _pth_list_dev ${MSLICE_DEV}) list(APPEND _pth_list_install "${_scripts_rel_path}/ExternalInterfaces")
 
 # development copy
 set(_scripts_pth_src "${CMAKE_CURRENT_BINARY_DIR}/mantid-scripts.pth.src")
diff --git a/scripts/ExternalInterfaces/CMakeLists.txt b/scripts/ExternalInterfaces/CMakeLists.txt
index 8775b866dee3..a14f752de3b4 100644
--- a/scripts/ExternalInterfaces/CMakeLists.txt
+++ b/scripts/ExternalInterfaces/CMakeLists.txt
@@ -1,45 +1,15 @@
-# Fetch any externally-managed interfaces
-include(ExternalProject)
+# Fetch any externally-managed interfaces include(ExternalProject)
 
-# mslice
-set(_mslice_external_root ${CMAKE_CURRENT_BINARY_DIR}/src/mslice)
-externalproject_add(
-  mslice
-  PREFIX ${_mslice_external_root}
-  UPDATE_DISCONNECTED "false"
-  GIT_REPOSITORY "https://github.com/mantidproject/mslice.git"
-  GIT_TAG cf985c648530d78d4d841896a6d2ead92a7a6b86
-  EXCLUDE_FROM_ALL 1
-  CONFIGURE_COMMAND ""
-  BUILD_COMMAND ""
-  TEST_COMMAND ""
-  INSTALL_COMMAND ""
-)
-message(STATUS "Fetching/updating mslice")
-execute_process(
-  COMMAND ${CMAKE_COMMAND} ARGS -P ${_mslice_external_root}/tmp/mslice-gitclone.cmake RESULT_VARIABLE _exit_code
-)
-if(_exit_code EQUAL 0)
-  execute_process(
-    COMMAND ${CMAKE_COMMAND} ARGS -P ${_mslice_external_root}/tmp/mslice-gitupdate.cmake RESULT_VARIABLE _exit_code
-  )
-  if(NOT _exit_code EQUAL 0)
-    message(FATAL_ERROR "Unable to update mslice.")
-  endif()
-else()
-  message(FATAL_ERROR "Unable to clone mslice")
-endif()
-# Let the parent lists file know where dev copy of mslice is
-set(MSLICE_DEV
-    ${_mslice_external_root}/src/mslice/src
-    PARENT_SCOPE
-)
+# mslice set(_mslice_external_root ${CMAKE_CURRENT_BINARY_DIR}/src/mslice) externalproject_add( mslice PREFIX
+# ${_mslice_external_root} UPDATE_DISCONNECTED "false" GIT_REPOSITORY "https://github.com/mantidproject/mslice.git"
+# GIT_TAG cf985c648530d78d4d841896a6d2ead92a7a6b86 EXCLUDE_FROM_ALL 1 CONFIGURE_COMMAND "" BUILD_COMMAND "" TEST_COMMAND
+# "" INSTALL_COMMAND "" ) message(STATUS "Fetching/updating mslice") execute_process( COMMAND ${CMAKE_COMMAND} ARGS -P
+# ${_mslice_external_root}/tmp/mslice-gitclone.cmake RESULT_VARIABLE _exit_code ) if(_exit_code EQUAL 0)
+# execute_process( COMMAND ${CMAKE_COMMAND} ARGS -P ${_mslice_external_root}/tmp/mslice-gitupdate.cmake RESULT_VARIABLE
+# _exit_code ) if(NOT _exit_code EQUAL 0) message(FATAL_ERROR "Unable to update mslice.") endif() else()
+# message(FATAL_ERROR "Unable to clone mslice") endif() Let the parent lists file know where dev copy of mslice is
+# set(MSLICE_DEV ${_mslice_external_root}/src/mslice/src PARENT_SCOPE )
 
-# Installation MSLICE_DEV is only set in PARENT_SCOPE! so don't use it here
-foreach(_bundle ${BUNDLES})
-  install(
-    DIRECTORY ${_mslice_external_root}/src/mslice/src/mslice/
-    DESTINATION ${_bundle}scripts/ExternalInterfaces/mslice
-    COMPONENT Runtime
-  )
-endforeach()
+# Installation MSLICE_DEV is only set in PARENT_SCOPE! so don't use it here foreach(_bundle ${BUNDLES}) install(
+# DIRECTORY ${_mslice_external_root}/src/mslice/src/mslice/ DESTINATION ${_bundle}scripts/ExternalInterfaces/mslice
+# COMPONENT Runtime ) endforeach()