Originally Posted by KARFA

I presume you have a fairly large gap between flights? How long is your connection?

You can land yourself and there is information at the bottom of post #2 on how to do this.

Bear in mind when you return to T5 you will have to speak to someone about unregistering you as 'Ready to fly' as the system won't record your exit and think you are still airside. Tbh I would probably just use the T3 arrivals lounge and head in to London though.