If I may explain a little further -
as Hellion advises, the drums are not fitted with standard drum skins, which are designed to resonate through the shell of the drum, they are fitted with thick plastic pads - also called practice pads because they are used where the noise of drums is not acceptable - player's home or where ever. The pad absorbs the majority of the noise, although the drummer miming on TOTP is not hitting the drums anything like as hard as he would in a proper concert situation - that wuld make a noise even on a practice pad.