Your location may be UK but in this part of the forum, you are asking for information from people who would most likely be living in Hong Kong.
If you were to ask people for an idea of the salary for FO, im more then sure people would reply in HK$ rather then change it in pounds for your benefit..
Edit: and your welcome, it is very very expensive and you'll find that the 7-8k(pounds) would go very quickly!