There is a bus stop on Bath Rd , to the right as you exit the Skyline and you can catch bus numbers 285, 555,556 to get to Hatton Cross. If you walk to the left to the light at Harlington Corner, then you have to go across diagonally to get to Harlington Corner stop, where a number of busses will take you to Hatton Cross.
When you return from town, you exit the tube up the stairs, go through the doors on the left. You then catch the busses going towards the Sheraton by walking out to the island out away from the curb.
Hope you have a great time!