To visit the UK for Business visits you can apply for a Standard Visitor visa if you are coming to the UK for conferences, meetings, training, academic research or a sabbatical.
When applying for the Standard Visitor visa for UK you will be required to complete the online application form, thereafter you must submit the application in person at the visa facilitation centre. A letter from the business or organisation who invited you must be submitted. In addition, you need to provide proof of any previous dealings with the UK Company that you are visiting. Your hotel booking and flight bookings should be included in your application pack as well as a travel insurance. The processing times are 3 – 4 weeks. The visa will be issued for up to 6 months.
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.
The other option would be to apply for a visitor doing a permitted paid engagement. For this option, you must have been invited to the UK because of your expertise. This visa allows you a stay for up to 1 month.