The club rating system is now up and running! It's really just for fun and to add a little spice to friendly games played between club members. Of course the number of games played so far is nowhere near enough to make it meaningful and the ratings bear no relation to ECF/FIDE ratings or the ratings you may get from chess.com or lichess.org.
If you just want to play without having your game rated then just agree it with your opponent. Rated games should, preferably, be played with a clock at a time limit agreed between you and your opponent - but it's up to you.