My husband and I have a 12 hour layover in London (arriving at 7AM, departing at 7PM) but just realized we will be flying into Heathrow and out of Stansted. We wanted to book the long layover so we had time to explore the city since none of us have ever been there, but now are trying to figure out if/how we can do this since we also have to switch airports before departing. We will likely have one big suitcase that will be checked and then each of us will have a carry on bag. Also to note, I will be 26 weeks pregnant at this time and while likely incredibly active (I am 20 weeks today and running ~30 miles a week), think it may be something important to callout.
Any tips on what we should do? I want to make the most of our time since its such a long layover, but not sure how we can do this in the most efficient manner.