Child Benefit rules are generally the same across London and the rest of the UK. You may qualify if you are responsible for a child under 16, or under 20 if they remain in approved education or training, subject to the usual residence and eligibility conditions. If you or your partner have income above the relevant threshold, a High Income Child Benefit Charge may reduce or effectively cancel the financial benefit, although claiming can still help protect National Insurance credits. Check the latest conditions and thresholds on GOV.UK, as these can change.