I don't think stabilsed approach criteria comes from the law. For me it is laid down by company SOP. As part of that it states that stabilsed approach includes:
"On the correct vertical profile".
4 whites is not on the correct vertical profile - and with 4 whites you can't be totally sure as to how far off that profile you are.
1000fpm below 500' has to be called, unless it had been briefed for (i.e. a known steep approach)
T'Bug
