Hmm. This one needs some energy. I suggest a non-tactical bifurcation with spiral tendencies: Oval / Alperton. Hopefully people will try to deal with this problem rather than running away, but then tactical bad play always was risky...
East - West moves, followed by some unused toots & some Left Hand Dominance... getting rather kinky in here... Which leaves no choice but Pontoon Dock invoking the new DLR route rule! So there!
A strange situation...nearly enough for the Waterloo & City line to be diddled, which has never happened in my lifetime. Sudbury Town out of sheer fear.