That's why there are 2 runways .. one to land and one to take off .. it's why LGW is limited to 55 movements per hour and why they'd like another runway.
In the USA some airports have more than two. Denver is fun they have 4 parallel 34 and 35 left and right of each and 25 and 26 going the other way. I've been on finals on one runway (35R) at KDEN in a 74 with a united 777 landing parallel (34L) a mile to the side.
At the risk of being shot down I think they often us (for example) 35L & 35 R for landing and 34 L and 34 R for take offs.