For my last renewal i tried multiple times to fill in the application on CELLMA.
Contacted the helpline and they still could not make it work. They told me to get my AME to manually force it into the system - which he did and issued me my medical. (Whilst graciously not charging me for the extra hour it took him to achieve this)
three days later i got an invoice from CAA for the 14 quid admin fee despite the fact that they had not actually done anything.
Cheeky F£$%@s