How much per-pupil funding will your school get?
Looking at this article, it seems schooling in the ESF system costs the same as in London given these are 2014 figures using 2014 exchange rates. The City of London spent HK$109000 per pupil in 2014. Considering the price of ESF in 2016 averages the same in 2016 for pupils without subsidies, and your earlier comparison that their education is similar than your tax funded education in the UK, I just don't see why you're saying that you're getting less bang for your buck.