It is not legal. If the 16 year old engages in any sexual conduct with the 13 year old, they could face statutory rape charges and the parental consent assuming there was any would have no bearing
Is it illegal for a 16 year old to date a 13 year old UK?
If youre over 16 and are charged with sexual activity with a 13-15 year old, youre more likely to end up in legal trouble than if you were under 16. No matter how cool and relaxed your parents are about your sex life, its still illegal to have sexual contact with someone under 16.
Can a 13 year old date a 17 year old in UK?
No. It is not illegal for a 13 and 17 year old to date.
Can a 30 year old date a 16 year old UK?
The age of consent in the UK is 16. This means that its against the law for someone to have sex with someone under the age of 16. It wouldnt be illegal for someone whos 16 to have a relationship with someone who is 30 - unless that person is their teacher or in a position of authority.