@1forward2back I had heard that Sutton High had moved to WL but I might have been mistaken (person was not directly involved, had heard from another mum) and you have first hand knowledge. They might have got confused with SCHS, which has gone to WL.
I have heard the same re: those moving / not moving that you mention in your email. Harrodian has also moved to WL.
PHS seems not to have moved to WL either. Deadline for them and WHS is Monday morning so would be interesting to see the impact that the later deadline has on them (I would have assumed that most people have made their decision already, unless that they are doubting between 2 schools with a Monday deadline... and pushing it to the limit).