Describe the bug
When using CORDEX data on a model with a rotated pole grid with the extract_location pre-processor it fails with:

ValueError: Interpolation coords must be 1-d for rectilinear interpolation.

The function: extract_point in preprocessor/_regrid.py

essentially needs extending to cope with cases where the latitude and longitude are not

Please attach

• The recipe that you are trying to run, you can find a copy in the run directory in the output directory
• The main_log_debug.txt file, this can also be found in the run directory in the output directory