The Government is currently running a consultation for allowing an extended range of emergency services to be exempt from speed limits
- Ministry of Defence bomb disposal units
- fire (other than for fire and rescue authorities which are covered)
- conveyance of human tissue for transplant
- blood transfusion
- mountain rescue
- mine rescue
- radiation emergencies
- coastguard and lifeboat launching
- lastly, the HM Revenue and Customs for their covert surveillance operations
The full consultation document can be found here:
https://www.gov.uk/government/consultations/speed-limit-exemptions