I agree with the above, but think that mass immigration since the 90’s has affected these statistics positively too.
The area I’m originally from is now mainly Black African, and this began to happen quite quickly about 12 years ago. It used to be mainly white British and working class. As a result, many churches have sprung up, and whole families frequent them. The families seem very religious, and whilst there are many young people, I can’t imagine many of them having teenage sex, or becoming teenage parents.
There are also many more young people of other faiths in the UK now compared to in the early to mid 90’s when teenage pregnancy was rife. Due to a combination of religion, and often very close knit communities and the idea of ‘shame,’ there do not seem to be many teenage pregnancies involving Muslim teenagers for example.
I used to be a Secondary school Teacher in recent years, and have worked in schools with students of vastly different ethnic and social backgrounds. In those schools, there were still students getting pregnant and sharing their pregnancy/STD scares with us. The ones who became pregnant were all white British.
I say the above as a white British person who is merely saying what she sees and has experienced.