I found out I got through to Stage 3 while in Australia too! ...Correlation??
I'm visiting the Heathrow tower on Monday night actually (can't wait!!) and going to Swanick on Sunday so it's going to be a busy weekend.
We were lucky enough to meet an ATCO at our stage 2 so she's the one who organised the Swanick visit and I emailed HR to see who I would need to speak to about getting a Heathrow tower visit so that's probably the best way to go. I called up on Monday and they booked me in for the following monday which was really speedy. Especially considering my stage 3 is on the 10th so I'm running out of time. Made it more difficult being in Australia and trying to organise the Swanick visit which I organised about 3 weeks ago now.
Really can't wait for my stage 3, I know that sounds crazy but I've been waiting a year for this opportunity and getting to go to Swanick and Heathrow within 24 hours of each other has really topped it all off.