Originally Posted by
goteed1
I have the same situation. If I check my bag all the way through, when I land at T3 do I have to follow the "connecting to" instructions or do I just go through immigration like I was exiting? If going through connections is there a way to exit T3 after that?
It's up to you what you do after landing - the airline has absolutely no control over your actions. If you want to go landside, just go to UK Border and that's it. When it's time to go back, you pass security and are back airside.
(of course this supposing that you have the neccessary paperwork to enter the UK - passport, visa, etc)