Harris westminster

Hi. So, I've applied to Harris Westminster Sixth Form and got rejected due to getting 430 score when the boarder line for Priority 3/4 is 443. I saw that you can still send your actual GCSE result (august) to them via email and in person. But I would like to know:
- The grades that u would need to actually be accepted into hwsf (since they only accept students with 6 of grades 7-9 normally, so does this mean I need higher grades than that to get in via result day way? So an average of around 8/9?
- The chances of getting in/how many people actually got in this way (GCSE result day hand-in way)?
- Would there still be interview after the result day hand-in?
If someone knows anyone/got in this way, PLEASE LET ME KNOW YOUR WAYS.
Thank you!