Refer to:
http://www.ukba.homeoffice.gov.uk/sitec ... iew=Binary
Snippet:
HOW TO APPLY FOR A RESTRICTED CoS
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242. There may be circumstances in which we wish to verify the information you have given on your application, for example if we have reasonable doubts about its validity. If we need to make any further checks to verify your application, we may ask you for additional information or documents. You must send us any information or documents that we ask for within 14 calendar days. If you do not send the information or documents within that time limit, your application will be rejected.
243. If you do send the information or documents within the time limit, but the date we receive them is on or after the 5th of the next calendar month, or we are unable to make the necessary verification checks before the allocation date you have applied for, we will hold your application until the following allocation date. If we have been unable to carry out those checks by the following allocation date, your application will be rejected.