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Good morning, I am Lawyer Ak and I will be assisting you today.
The cost of visit visa to U.K. is £91. It takes 15 days processing time.
I hope this answers your question. Please do come back to me if you need any further clarification.
For 7 days processing time it can be up to £500 depending on currency.
I cannot give exact price it will be dependent on each airline.
You should receive a booking confirmation for hotel booking.