You are encouraged to apply for a visa as soon as you have registered for the conference. For some countries, visa application processing can take longer than 90 days. Plan to schedule your visa interview well in advance of your departure date in order to accommodate the processing time.
Check if you need a visa to the UK here: https://www.gov.uk/browse/visas-immigration
If you need additional advice please get in touch with your local British Council office.
The Going Global team are unfortunately unable to assist with visa arrangements, and are not able to write letters of support for a visa application. Please use your automatic registration confirmation as proof of your participation at the conference.