Sounds more like a severe microburst with extreme rainfall after in my opinion.
Egg shape twisting could easily be this which is the start of a microburst before it finally collapses onto land.
Still hopeful that this mess won't be gone from all models by tomorrow morning. I'd say we're in a decent shot for something.
AROME 18z is running currently, hoping it stays like the 12z.
East Anglia looks like it could be in for something tomorrow night/early hours with a weakening MCS modelled crossing the sea, moving WNW.
Could hit Essex/Kent too.