You guys have been so very helpful! Another question- we arrived at Luton on Wed June 5 at 1:05pm. Our AirBnB is by London Bridge. Google Maps says National Express-->Jubilee or Thameslink. The second option seems more direct...? I read online last night that to get on the shuttle to the Thameslink I need to prepurchase tickets online.... my concern is that if I buy tickets and my plane is late, etc. Any thoughts or advice? thanks!
*edit: I also notice from the AirBnb to LGW when we leave is Thameslink as well.