Mainline stations are wild in the 2007 Flood variation. Don’t you mean the 1936 Flood variation? Which of course is not covered by the post-WWII summer rules.
Shall we step this up a bit and see who the serious players are round here? Using the Cassidy method I’m going to skip all mainline options, finesse the entire Circle line with the exception of Piccadilly line interchanges and play Putney Bridge – who can recover from that?