WERNER Seifert, head of Germany's Deutsche Borse intends to send a formal document to the London Stock Exchange addressing concerns over clearing, settlement and regulation in the hope of pushing through an agreed deal.Arch-rival Euronext is thought to have made an informal approach to the LSE about a counter-offer. There were a few red faces at Euronext yesterday after its second technical blunder in a week. Trading at its Paris, Amsterdam, Brussels and Lisbon exchanges was disrupted for more than two hours due to an electronic breakdown.