If your monitor's over six months old under SoGA OcUK don't have to offer you anything unless you can prove that the problem was inherent in the monitor when you bought it. Your warranty is between you and the manufacturer and, as such, irrelevant. If your monitor is less than six months old then, as there is no chance of repair or sensible replacement I'd say in this instance refund is the only practical option. They stopped selling this monitor years ago though, right?
Proving that the problem is inherent is an uphill struggle, especially as only a handful of people have reported this problem and absolutely tons of these monitors were sold (they were a steal when they first came out).