Уже давно Business Visitor объединили в Standard Visitor. 
The Standard Visitor visa has replaced the: 
    Family Visitor visa 
    General Visitor visa 
    Child Visitor visa 
    Business Visitor visa, including visas for academics, doctors and dentists 
    Sports Visitor visa 
    Entertainer Visitor visa 
    Prospective Entrepreneur visa 
    Private Medical Treatment Visitor visa 
    Approved Destination Status (ADS) visa 
<noindex>https://www.gov.uk/standard-visitor-visa</noindex> 
Если екскурсия на завод, то подавать на Standard Visitor! 
  
If you visit the UK on business 
You can apply for a Standard Visitor visa if you want to visit the UK for business-related activities, eg: 
    you’re coming to the UK for a conference, meeting or training 
    you want to take part in a specific sports-related event 
    you’re an artist, entertainer or musician and coming to the UK to perform 
    you’re an academic and are doing research or accompanying students on a study abroad programme 
    you’re a doctor or dentist and are coming to the UK to take a clinical attachment or observer post 
    you want to take the Professional and Linguistic Assessment Board (PLAB) test or sit the Objective Structured Clinical Examination (OSCE) 
    you want to get funding to start, take over, join or run a business in the UK