“…the new claim arises out of the same facts or substantially the same facts as a claim in respect of which the party applying for permission has already claimed a remedy in the proceedings.”
“Whether or not the new cause of action arises out of substantially the same facts as that already pleaded is substantially a matter of impression.”
“…will be slow to interfere with a decision of a judge on an issue of this kind.”
“Although ... the issue whether the new claim arises out of substantially the same facts as that already pleaded is substantially a matter of impression, the impression must nevertheless be derived from a reasoned assessment of the relevant factors.”