I spent so long trying to twist and turn the outside ring, thinking I had to unscrew it! I didn't realise you pushed down one button and slid the other one up.
The screw was too tight in the lid, which meant the toilet didn't stop 'flushing'..I didn't think it was that bad until we just had a *huge* recent water bill through, so I turned off the water and the tank was emptying and re-filling every 5-10 minutes - therefore using the equivalent of around 150 flushes of water every day just from the one toilet!
Thanks again..our toilet is a Roca, and their website is useless when it comes to customer support!
Steve
April 2009