"Manpower is the UK’s leading employment expert offering a full range of options to help businesses and individuals choose their way in the contemporary world of work. We employ over 30,000 people every day through a network of over 300 UK offices providing staff for around 5,000 clients. With employment opportunities in the public and private sector, on both a permanent and temporary basis, we make it easy for people to find employment and for companies to find staff with the skills they need. Permanent and temporary positions. Holiday, maternity or sick cover, through to large workforce transformation and outsourcing contracts."
Here is a link to a video that explains what they do.