Models are really struggling to get to grips with this LP and the potential precipitation it will bring.
Regardless of what the forecasts / charts are showing, some areas in the south could miss out completely and your neighboring towns may end up with 20cm....it's just so much of an unknown quantity still until we get closer and the hi-res models can try and nail something down.
My prediction is the entire south region from Kent to Dorset will take a hammering, it may even correct northwards to bring places like Oxford into the mix...who knows