The CFAUK website only mentions Level 4, both under the ‘CFA’ and ‘CFA Level 1’. Not sure if Levels 2 and 3 get you any extra credit there.
The only other bit I could find was that the full CFA designation translates to Level 7:
Level six is the equivalent of a Bachelor’s degree, while level four equates to the first year of a degree. The CFA and Chartered Wealth Manager designations both equate to level seven.