I refer to MB of Guildford’s enquiry, and to your response, regarding what action to take if you are impeding an emergency vehicle on "blues and twos". He is correct when he says that motorists have been fined for, say, crossing the 'Stop' line at red traffic lights. One motorist wrote to a motoring magazine and said you should not do it. His letter elicited a reply from a senior police officer who said that if he were on "blues and twos" and a motorist failed to get out of his way, then he (the police officer) would prosecute the motorist for "obstructing a police officer in the execution of his duty". You can't win. The Home Office has never clarified this situation with directives to motorists and police as to the correct approach to be taken by both parties.