Can I still use R22 for service and maintenance?

No.  In the EU it is illegal to use R22 for service and maintenance.  The use of virgin HCFCs was banned in the EU at the beginning of 2010 and the use of reclaimed and recycled refrigerant was banned on 1st January 2015.  Whilst systems on R22 can be kept running, it is illegal to top up a system with R22 or other HCFCs.  See our Legislation page for more information and check our recommendations for converting HCFC refrigerants to other refrigerants.