We had one the same as yours too.
After a month they sent all the paperwork back, as it was on the wrong application form, and some 'evidence' was not acceptable (Many thanks to our 'Specialist Immigration Solicitor!). When we re-submitted (because ours is not a 'normal' application!) we got the same letter again, but after 7 weeks, they said that the Initial Consideration Department could not deal with it, and it would have to be passed to the Specialist Department, and we would hear no more until March 2004, due to the heavy caseload of Asylum seekers !!!
I am sure that if yours is a 'straightforward' application, the Initial Consideration Unit will pass it, and it will be just a matter of a few weeks until you get your FLR.....Good Luck
Regards
John