UK syllabus is not as easy as the past. GCSE is now much more difficult. And there are many elite students coming from Mainland China, Singapore and even Nigeria. As Ruthin Headmaster said, the standard of HK students are lower competitive in recent years. If you are not hardworking or just HEA, then don't study in the UK.
Sad but true, it is not easy for HK students to enter top 50 UK boarding school now!
A good piece to share, my daughter also went to UK for Year 10 this year, she is extremely happy, no pressure, everything she learnt before in Hong Kong. Her teachers, classmates are super nice.