Thanks everyone for the helpful information. It has given us plenty of food for thought. Nick Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK. Latitude 55 24'56" Longitude 4 26' 00". To UNSUBSCRIBE from the 'meteorobs' email list, use the Web form at: http://www.tiacdot net/users/lewkaren/meteorobs/subscribe.html