Just been watching flightradar, and flight FR2283 went around at 400 feet. Looks like it is diverting to Lodz.
I visited Warsaw last month, and used Ryanair's service from London Stansted (£16 return!). We were not convinced that the aircraft would land in Modlin, the fog was terrible. However we did land, which was a shame
Was hoping for a diversion into Chopin airport, save the 50 minute bus journey
