Uber will appear in court Monday in a bid to stay operational in London — its biggest European market. Representatives for the ride-hailing giant are appealing the loss of its operator’s license after it was revoked by the city’s transport regulator last September; reasons cited included passenger safety, the company’s failure to report drivers’ criminal activities, and its use of tracking technology. Uber will now have to prove it has made substantial changes in a case that will have ramifications for its entire business.