From 16 December 2013, if you are applying for a visa from outside the UK, you will be asked to fill in a new customer satisfaction survey. The survey was initially launched in October 2013 for customers applying for a visa in the UK.
If you are applying for a visa from outside the UK, you will receive an email inviting you to fill out a survey via a web link after you have received a decision on your visa application.
If you are applying for a visa in the UK, you will be able to access the survey through a web link and QR code which will be in a footnote at the bottom of your decision letter. Customers who provide a valid email address with their application will also receive a survey invitation by email.
Your feedback is very important to us so please take the time to tell us what you think about the service that we provide.
Read more here:: https://www.gov.uk/government/news/new-customer-satisfaction-survey