The Kenwood Ladies Pond, on Hampstead Heath, is a popular choice for both swimming and sunbathing. It is very deep so you must be over eight and a strong swimmer. In the winter, pre-booking is required. https://www.cityoflondon.gov.uk/things-to-do/green-spaces/hampstead-heath/where-to-go-at-hampstead-heath/kenwood-ladies-pond
There are two ways to swim in the beautiful Serpentine (right in the middle of Hyde Park). One is by joining the Serpentine Swimming Club. The Club swim year round (including Christmas day) between 5 am and 9:30 am. They are not currently accepting new members but keep checking back: http://serpentineswimmingclub.com/ There is also the…
Central Tickets offers a seat filling service to theatres. It is free to join and access many shows – musicals, plays and concerts. Many days there are more than 100 shows on offer. You need to be discreet (don’t tell people on social media or at the theatre that you are seat filling). It would…
If you are a “local hero” (teachers, social care workers, prison officers, armed forces, ‘blue light’ professionals and Max Card holders), ATG offers 25% off many of their shows. I have not seen any central London shows offered, but Richmond Theatre and Wimbledon Theatre are included. https://www.atgtickets.com/campaigns/local-heroes/featured-shows/?fbclid=IwAR1wET1W3AgvZn0Jrm6cnpd6pei-4PSFISfbJ2n-a2c3-2AAnNBP7AZQcAw

Discounts: The Young Barbican scheme provides discounted tickets for 14-25 year olds, ranging from £5 to £15 for various shows.

Discounts: The Royal Shakespeare Company offers £10 tickets for ages 14-25 and students, covering various productions including Matilda and Totoro.