LONDON (AFP) - Fresh snowfalls swept northern Europe once again Thursday, causing misery for travellers as airports remain closed, roads were blocked and Eurostar international rail services were cancelled. The unseasonable cold snap, which has lasted nearly a week, has caused Britain to grind to a halt, with thousands of schools closed and commuters stranded as rail services were cancelled and icy roads deemed unsafe. Gatwick Airport, Britains second busiest airport after Heathrow, closed for a second consecutive day and Edinburgh Airport was also shut, sparking outrage at the nations apparent inability to cope with the cold. Ministers have promised a review of how the transport network is coping, as newspapers warned Britain had become a laughing stock abroad, but pointed out that the rest of Europe was also faring badly as temperatures plummeted. Eurostar, which runs trains between London and Paris and Brussels, cancelled more than 20 trains Thursday and advised customers to postpone their journeys. Those that do travel could be subject to delays of up to 90 minutes, it said. Geneva international airport only reopened Thursday morning after heavy snow caused it to close for a day and a half, but its schedule was still subject to heavy delays. Dozens of flights were cancelled or delayed Thursday at airports in Paris, Prague and Frankfurt - one of Europes key air hubs. The freezing weather has claimed 26 lives across central Europe this week, including 18 deaths, mostly of homeless men, since Tuesday in Poland, where temperatures plunged to minus 33 degrees Celsius (minus 27.5 Fahrenheit). Snow storms that have swept the continent in recent days intensified in many places Thursday, including in London, where the first proper falls of the season left landmarks such as the British Museum covered in a layer of white. But the pretty pictures belied the misery felt by many commuters stuck as services into the capital failed, a situation condemned as unacceptable by Jo deBank, communications officer for rail passenger watchdog London TravelWatch. After severe disruption in the last two years, we were assured that lessons had been learnt and contingency plans put in place, so we are bitterly disappointed at the delays and cancellations suffered by passengers, she said. Many people gave up - one survey suggested that two in five staff across Britain were not able to get to work on Thursday morning, while a similar number were late arriving. Insurer RSA estimated that the bad weather could cost the British economy up to 1.2 billion pounds (1.9 billion dollars) a day. Others who braved it had trouble getting home, and hundreds of passengers were forced to bed down for the night in a freezing train which failed amid heavy snow at a station in Sussex, southeast England. Forecasters warned temperatures were likely to fall even further overnight Thursday, plunging to as low as minus 20 degrees Celsius in Brandenburg, the region surrounding the German capital. France also suffered from freezing weather, and in Lamballe in the northwestern region of Brittany, 500 people had to be put up for the night in camp beds in a local hall and school after they were stranded in their cars. Hundreds of trucks were stranded on roads by snow and ice in Brittany and neighbouring Normandy, the two regions hardest hit by the cold snap. And it was not just snow - in the western Balkans, heavy rain caused flooding in Bosnia, Croatia, Serbia and Montenegro, with more than 1,000 people evacuated from their homes, local media said.