endowment maturity schedule

lexi

Hi,
Luckily my endowment is due to mature on 13th march 09. today i received a letter from clerical/medical, saying it has written to the nationwide to deal directly with them. attached to the letter was a schedule of maturity benefits.
sum assured - £6128.00
Reversionary ( inc interim) bonus - £8179.60
Guarenteed terminal bonus - £1716.90
Total maturity amount £16024.50
we owe £16000.00.
it then says they guarentee they will not pay less than the above amount, but if rates increase will increase the maturity.
I presume then that after sending this amount to nationwide we will have a grand total of £24.50 returned? Or is it likely that the amount will change in the next month? plus i guess i just sit & wait until march?
btw what happens to the deeds when everything is done & dusted?
sorry about the the questions! lexi