Photo Hippo Labs in Burnley still develop and process 35mm film in the UK.  They offer many different processing services by mail order.

Lets me give you a brief history lesson about 35mm camera film.....

The 35mm film format has a long and fascinating history, stretching back over a century to the very beginnings of photography. Here's a brief overview of the most important developments in the history of 35mm camera film:

Early experiments: The first experiments with motion pictures date back to the late 19th century, when inventors like Thomas Edison and the Lumière brothers began to develop technologies for capturing moving images. In the early years, most of these technologies relied on bulky, expensive equipment, and were used primarily for scientific or entertainment purposes.

Introduction of 35mm film: In the 1920s, the German company Leitz introduced the first 35mm film camera, called the Leica. This camera was designed for still photography, and it quickly became popular among amateur and professional photographers alike. Because the 35mm film format was so much smaller than earlier film formats, it allowed for much smaller and more portable cameras.

Adoption by Hollywood: In the 1930s, Hollywood began to adopt the 35mm film format for motion pictures, thanks in part to the development of more sophisticated cameras and lenses. Filmmakers like Alfred Hitchcock and Orson Welles began to experiment with the new technology, using it to create groundbreaking films like "Vertigo" and "Citizen Kane."

Standardisation: In the 1950s and 1960s, the 35mm film format became the standard for both still photography and motion pictures. This was due in part to the development of standardized film stocks, which made it easier for photographers and filmmakers to achieve consistent results. During this time, a number of new camera manufacturers, including Nikon and Canon, began to produce high-quality 35mm cameras for both amateur and professional use.

Decline and digital revolution: In the 1990s and 2000s, the 35mm film format began to decline in popularity, as digital cameras became increasingly advanced and affordable. Many professional photographers and filmmakers continued to use film, but it became less common among amateurs. Today, 35mm film remains an important part of the history of photography, and many artists and enthusiasts continue to use it for its unique aesthetic qualities.

Overall, the history of 35mm film is a testament to the enduring appeal of photography and the ways in which technology has evolved over the past century.