What kind of documentation will my wife receive for her UK spouse visa entry?

OK to be clear. If she is successful in her application when she collects her passport back from VFS it will have a vinegarette sticker in it like the one someone else showed. The valid from date on that is the first date she can enter the UK. That is all she needs to enter the UK on a spouse visa. The vinegarette will say what kind of visa it is. The vinegarette sticker is valid for 3 months so she must enter the UK within that time limit. You will also get a letter which will tell you what to do in the UK. Basically once in the UK she will need to collect her Biometric Residence Permit (BRP) from a local post office. That will be valid for 30 months and will have an expiry date on it. She will use the BRP with her passport if she leaves and returns to the UK.

She shall also receive a Biometric Card