I agree with LadyJ, when you reach immigration in the UK they have the right to re-check ur application. They ultimately have the right to accept or deny ur entry into the UK, therefore it is advisable to carry all of the documents that used in ur application and also for your future reference.
In my experienced, they asked me to show my fiance's supporting letter only but in my visit visa, they asked to see all my documentation so it is just a luck of the draw as to what they might ask for.
Goodluck and have a safe journey!
