Maybe you can call UKVI and tell then you are inquiring since you never got a letter along with your documents. This will put your mind at rest with regards to what result you got for your application.
Immigration Enquiry Bureau
Telephone: 0300 123 2241
Textphone: 0800 389 8289
Monday to Thursday, 9am to 4:45pm
Friday, 9am to 4.30pm