We encourage anyone who requires a UK visa to apply as soon as possible - you can apply up to 3 months in advance of your travel date. UKVI aims to process non-settlement applications within 15 working days from the date you submit your biometrics at the visa application centre unless you have applied using the priority visa service. If your visa decision is going to take longer than 15 working days UKVI will send you an email to update you.
If you do need to contact UKVI, their International Enquiry Service details are at UKVI website.
Staff at the Visa Application Centre and at the British Embassy cannot help you with any visa enquiries or speed up your visa application.
Information about applying for a UK visa is on the UK visas and immigration website