Christchurch is the largest city of the New Zealand. It is known for its English heritage, including the Gothic Revival architecture of its city center. Visitors can explore the Christchurch Botanic Gardens, which feature a wide variety of plants and flowers from around the world, or take a punt tour along the Avon River. Other popular attractions include the International Antarctic Center, the Christchurch Art Gallery, and the Canterbury Museum. The city is also a gateway to nearby natural wonders such as the Banks Peninsula, and the Southern Alps.

There are several airlines that offer direct flights from London to Christchurch, New Zealand. These include Air New Zealand, British Airways, and Qantas. The flight duration is typically around 23 hours, with one or two stops depending on the airline. The cost of the flight can vary depending on the time of year and how far in advance the ticket is purchased. It is recommended to check with multiple airlines and use fare comparison websites to find the best deal. Keep in mind that international travel may be affected by the ongoing COVID-19 pandemic, so it's important to check the restrictions and requirements of both the departure and arrival countries before booking any flight.