(Updated Blog on 10 April 2017:https://ukimmigrationjusticewatch.com/2017/04/10/know-the-procedure-brand-new-home-office-guidance-on-validity-and-rejection-of-leave-to-remain-applications/?iframe=true&theme_preview=true
The importance of ensuring that an application sent to the home office is accepted as timely and validly submitted is to ensure not only that an applicant with leave to remain continues to benefit from remaining legally here whilst that application is under consideration but also that they are able to continue working during that time if they fall in a permitted category.