Add one more acceptance test for new regridding (#1508)
Add one more acceptance test for new regridding (#1508)

* add one more acceptance test for regridding

* change comments in test_regrid

* Update improver_tests/acceptance/test_regrid.py

Co-authored-by: Tom Gale <96835dd8bfa718bd6447ccc87af89ae1675daeca@gale.app>

Co-authored-by: Tom Gale <96835dd8bfa718bd6447ccc87af89ae1675daeca@gale.app>
metoppv/improver,metoppv/improver,fionaRust/improver,fionaRust/improver