Use 27700-5622 transformation in projection definition
Use 27700-5622 transformation in projection definition

This is almost certainly not the correct transformation for our data but
visually it does seem to line up better than what we had before. We should
revisit this later.

LandRegistry/digital-register-frontend,LandRegistry/digital-register-frontend,LandRegistry/digital-register-frontend,LandRegistry/digital-register-frontend