It might be possible for London to merge with Virt-X, where Swiss shares with international appeal are to be found, but if it tries something more ambitious and opens its arms to Nasdaq, others will counterbid. Euronext, the amalgam of the Paris, Brussels and Amsterdam exchanges which already owns Liffe, the London futures market, would surely have a tilt. So would Frankfurt's Deutsche Borse. Both would rather avoid a bid battle but could not afford to stand aloof if one started because the prize is to be unchallenged as the dominant market organisation in Europe.