I’m going to apply for a UK standard tourist visa along with my wife and kid. I have enough savings to fund my 10-days visit. I'm planning to attach an invitation letter from a friend residing in the UK, and we'll be staying at his house. He'll accommodate us but all other expenses I'll take care of myself.
So, besides the invitation letter, what other documents should he send me for my tourist visa application? Is it a good idea to attach an invitation letter from a not-so-close friend? Does he need to attach his financial statements to invite me when I have enough funds to support our trip?