Classifications & Division
UK Airspace is divided into two Flight Information Regions (FIR's). At and above FL245, this is known as the Upper Flight Information Region and below FL245, it is known as the Lower Flight Information region.
VFR flights are not permitted in Class A airspace - Special VFR is permitted in Class A Control Zones.
Class A airspace in the UK can be found in the London and Channel Island Control Zones and airways above FL245.
There is currently no Class B airspace located within the UK.
Class C airspace in the UK can be found between FL195 and FL245 throughtout the UK.
Class D airspace in the UK can be found in most control zones around airports.
Class E airspace in the UK can be found in the Newcastle control zone, and the Scottish TMA.
Class F airspace can be found on Advisory Routes in Scotland and Northern England.
Class G airspace is Uncontrolled Airspace - More than half of the UK airspace is class G, and can be found all around the country.