I'm on BA 2153 (3 class) to BGI in Y on 2nd March and have selected 17H because the online seat map shows the missing seat 16H in front with 17 as the second row in Y. All other seat maps I've found, including the BA website and Seatguru show the missing seat as 15H, with 16H as the seat to go for in the second row with the extra legroom.

Is there any way of confirming if 17H is indeed the one to go for to get the extra legroom on my flight? Row 16 being the front row in Y is blocked for me in Manage My Booking as a Oneworld Sapphire