DHL are now offering an express courier service for UK visa applications, except settlement applications, in Mongolia. The cost of this service is $125 and must be paid at the DHL office before submitting your application. This service does not affect the outcome of your application.
The UKBA said: Mongolian visa applications are couriered to Beijing where they are processed and then returned to Ulaanbataar via courier. Using the existing standard courier service, processing and returning of documents usually takes between 15 and 25 working days. The new express service will reduce the time taken by up to 6 working days.