London

Absolutely, I'd be happy to help you plan a fantastic family-friendly itinerary for your 4 days in London, taking into consideration your constraints. Let's get started!

Day 1:

• Morning: Start your day with a visit to the iconic Tower of London. Explore the Crown Jewels and learn about the history of this historic fortress.
• Lunch: Head to Borough Market for a variety of food options. There are plenty of allergy-friendly choices available.
• Afternoon: Take a leisurely stroll along the South Bank of the River Thames. Visit the London Eye for a bird's eye view of the city.
• Evening: Enjoy a family-friendly dinner at a restaurant that caters to allergies.

Day 2:

• Morning: Visit the Natural History Museum, a great place for kids to learn about the natural world.
• Lunch: Have a picnic in Hyde Park, making sure to pack allergy-friendly snacks.
• Afternoon: Explore the interactive exhibits at the Science Museum.
• Evening: Take a relaxing walk around Covent Garden and enjoy street performances.

Day 3:

• Morning: Visit the Warner Bros. Studio Tour - The Making of Harry Potter. A must-visit for any Harry Potter fan in the family.
• Lunch: Enjoy a meal at one of the allergy-friendly restaurants near the studio.
• Afternoon: Head to Wembley Stadium to catch a soccer game. Make sure to inform the staff about your child's allergy.
• Evening: Have a quiet dinner at your accommodation or a nearby restaurant.

Day 4:

• Morning: Explore the historic Greenwich area. Visit the Royal Observatory and the Cutty Sark.
• Lunch: Enjoy a meal at a family-friendly restaurant in Greenwich.
• Afternoon: Take a boat ride on the River Thames to see London from a different perspective.
• Evening: End your trip with a visit to the West End to watch a family-friendly musical or play.

I hope this itinerary gives you a good starting point for your family trip to London. Feel free to adjust it based on your preferences and any specific interests your family may have. Have a wonderful time exploring the city!