I recently had a new Reginox 1.5 bowl sink installed. The sink is approx 18cms deep but unfortunately the overflow is positioned just over 10cms from the bottom which means I can't fill the sink much more than half. I contacted Reginox to ask whether there was any way of blocking off the overflow which I don't actually want anyway but they were less than helpful. So I was wondering whether anyone could suggest how I might block it off without going to great lengths. Any constructive help much appreciated.