In the next few days, collectors from all over the world will congregate in London for Frieze Week. But who are those who buy and support contemporary art in Britain, day in, day out? ARTINFO UK has gathered a list of some of the country's most influential collectors, from the champion of emerging artists Anita Zabludowicz to the photography scholar Michael Wilson.

Others could have been included. Lakshmi Mittal, ArcelorMittal CEO and Europe's richest man, merits a special mention here: not only did he contribute £19.6m ($31.7m) to Anish Kapoor and Cecil Balmond's Olympic tower The Orbit, but he also purchased the 2012 Serpentine Gallery Pavilion designed by Herzog & de Meuron and Ai Weiwei for his collection. Yet when contacted by ARTINFO UK, Mittal's office chose not to disclose further information on the billionaire's private art pursuit.

We have chosen to focus on the most visible philanthropists. Most of those included in this selection are also dedicated patrons, playing an active part in the country's art scene with their own ventures — the David Roberts Art Foundation, Robert and Nicky Wilson's Jupiter Artland, Frank Cohen's soon-to-open The Dairy — or backing public galleries. Some even bring their scholarly expertise to acquisition committees in major art institutions, like Tate and the British Museum. At the glitzy end of the art world spectrum, they help make the UK, and London in particular, an international art hub.

To see ARTINFO UK's illustrated Who's Who of the British collecting world, click on the slide show.