The night rating is a simple 5 hour course with no exams or flight tests.
It consists of at least:
• 3 hours dual night training
• 1 hour dual night navigation
• 5 take offs and full stop landings as pilot in command
The rating is issued by the CAA (Fees apply) and is current on either SEP or MEP.
You can complete this as part of your PPL, subject to certain conditions, or start it later, there is no minimum requirement.