Yes, the London Zoo (ZSL London Zoo) participates in the popular "National Rail 2FOR1" offer, which allows two people to enter for the price of one full-paying adult. To utilize this discount in 2026, you must travel to London by train and possess a valid National Rail ticket for the date of your visit. Eligible tickets include paper tickets with the "National Rail" logo or specific digital tickets, but excluding Oyster cards, London Underground tickets, or contactless payments. To claim the offer, you must visit the official "Days Out Guide" website, register, and pre-book your 2FOR1 admission tickets online through their dedicated link; on-the-gate purchases are no longer eligible for this specific promotion. Upon arrival at the zoo, you are required to present both your pre-booked 2FOR1 entry tickets and your valid train tickets (either physical or digital) at the entrance. This offer is a significant cost-saver for families and tourists, making the world-famous zoo in Regent's Park more accessible while encouraging the use of public rail transport. Always check the "Days Out Guide" for specific block-out dates, such as bank holidays or special events.