To Work in the UK you need the UK Work Permit, You cant work in UK on Visit Visa or on Student Visa(Only limited hours). UK has a bright market for the job seekers but you need a UK work Permit to work legally in UK. The following is the procedure to get UK work permit.

The employer submits a work permit application on the appropriate form. For the Business and Commercial Work Permit this is a WP1 form and there is a £153 administration fee.

Once approval against the work permit has been given the individual (and any dependants) will be required to apply for entry clearance at a British Diplomatic Post before travelling to the UK.

UK Work permit holders who have a permit for 6 months or less are not required to obtain this entry clearance unless they are a visa national. However Work Permits (UK) encourages all work permit holders to obtain entry clearance.