British air passengers could face further disruption from a volcanic ash cloud that has affected European flights. Most of northern Italy's airports were closed until at least mid-day today, and France, Switzerland, and northern Portugal may also be affected. The Met Office said ash could return to UK airspace today and next week. Six Scottish airports will be closed until at least 1300 BST. Flights to Spain, France and Portugal were grounded yesterday. <br/><br/>