My wife, two friends and I are planning to travel together to attend a wedding in the UK. Can we apply for our visas together or does it need to be done separately. What documents are needed?
Each person must apply individually for a visa to enter the UK. In the process, you will be asked with whom you are travelling, but there is no group application process.
Guidance on the documents required is here https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/549692/Visitor_Supporting_Documents_Guide_-_English_version.pdf