Yes oneten and f2k, I did the same. I received a similar e-mail from them suggesting to resubmit to Shffield address. I did it on the second day I received response from them. Without changing original forms, I just did a little bit of imporovement in supporting documents over night as I was in hurry when i applied first time.
The disappointing thing is that they do not bother to check things properly, it was funny to see that original receipt copy of airway bills were also inserted in the envelop they sent me which has a date of 31 March.
I just hope this time they will have a look at least on the proofs I provided ..............courier bills and CC slips etc.

I am just counting 15 days. it may come back to me with the same excuse. who knows
Best of luck to you too:)