The reason the Netherlands (and my country) have very very low numbers of teenage pregnancy has nothing to do with better sex ed, I am absolutely sure of this (and yes, I'd like more research to find out the facts) - UK schools have the best sex ed long-term education in the world, from my personal observations in many schools - from a very early age discussing relationships, respect for oneself and others, peer pressure, etc- to extremely detailed factual info on all the methods and their drawbacks (that is not one of the approved methods btw) and risks, failure rates, etc. Sex ed in the UK is brilliant.
There is something 'broken' in some parts of British society, it is one of the most divisive in the world - where people live in separate ghettos too often, with separate and very divisive schools- and where different sections of the population never meet, never communicate, and are set one against the other. Where young people in some sections have little aspirations, little chances of mobility, and have grown up in families where this has been the case for several generations. And with the rest that does not care and see them, sometimes rightly, most of the time not, as scroungers. Where young women from early teenage are expected to 'serve' the young men sexually in a very sad way - and where they have not sufficient respect and confidence to say 'NO'. Where the expected love of a baby is seen as the only love they'll get. And, for some, where having a baby is seen as a means to access a flat and an independent life. Tragic.