When filling out the application, I put in the date fingerprints were submitted because it's the only record I had regarding previous applications -- I had calendar events from years past for enrolling biometrics, but I had not noted anywhere the date that I actually submitted my application. As my BRP RC has been accepted (as of yesterday!!), I'm assuming this answer was satisfactory for the Home Office.
You know if you've just received your BRP (within the last 10 working days), and noticed a spelling mistake -- you're supposed to e-mail BRPError@homeoffice.gsi.gov.uk
providing your full name, date of birth, nationality, case reference number, contact telephone number, and exact details of what is wrong with the BRP. If it has been more than 10 working days since your BRP was issued and you just noticed the mistake, then maybe the BRP RC is the correct form for you. Nevertheless, if you can get away with emailing the address above and having the issue fixed that way -- I imagine that would be a whole lot faster/cheaper of a process than submitting the BRP RC. As you can see from this forum, best case scenario for the BRP RC is 4 weeks without your documents and 60 pounds paid. Worst case scenario can be much, much longer. I'm at 7 weeks and have just received my documents today... But am still waiting on the new BRP itself! Good luck, amit0277!