I've posted in the wrong thread for awhile because initially I applied for the wrong thing.

Anyway my visa is expiring tomorrow 5.2.16. Our application is all sorted, brimming with shiny folders of evidence, signed and all.
The only thing that is missing is evidence of a joint bank account because we have limited evidence on shared finances. We had to wait till HO sent back my passport, we then applied for this account, approx. 2 weeks ago, had to wait for a letter, brought in identity documents and were then told vague timescales about when it will be set up. We've called a couple of times to check and we've been last told it will be set up between 3-5 days. In hindsight, we should've applied straight away for joint bank accnt but I waited like a week thinking it could've been done on the day, so stupid

I am so scared, I really didn't want to send this application late because I don't want to be an overstayer. But I know this piece of evidence will really help us.
I've thought about the options:
1) Send in the application as is on 5.2.16 and mention that an account is being set up within 3-5 days and the initial date of applying with the request for information as part of the evidence
2) Wait until the account is sorted and then send in the application - it will be within 28 days of when my visa expires but not sure if that grace period applies to me because I'm not currently on leave to remain, I'm on a youth mobility visa.