The current system of transition altitudes (TA) is a total mess. The TA varies between 3,000ft and 6,000ft, with some areas of airspace having different TAs at different times of the day.
Surely it must be a matter of priority to introduce a common terrain safe TA within the UK , and then decide whether a higher TA (10,000ft; 12,000ft or 18,000ft) should be introduce throughout Europe?