The frequency flights are available daily between Beijing, Shanghai, Hong Kong and London Heathrow Airport. So your plan of Tibet tour from UK could start from London Heathrow Airport and Gatwick Airport, both of which are the mainly international airport of Britain. Besides, the budget airlines are usually arrival at Stansted, London City and Luton Airport, which usually operate domestic flights and some between European cities.
London Heathrow International Airport is located about 50 kilometers away from London city, which can easily get by Heathrow Express - about 15 minutes, ?11.5 per person, Subway - about 55 minutes, ?3.8 per person, A1 and A2 Bus - about 80 minutes, ?15 per person, and Taxi - about ?50.
Gatwick International Airport can be found about 100 kilometers away from London city center, which can also easily acceptable by Gatwick Express - about 30 minutes driving to Victoria Station, ?21.5 per person, No. 023 Bus - about 2 hours driving to Victoria Coach Station, ?5 per person, and taxi - about ?85.
Stansted Airport is located about 110 kilometers away from London City center, which offers convenient traffic ways such as Stansted Express - about 45 minutes driving to Liverpool street station, ?13.8 per person, runs every 15 minutes, No. A6 Bus - Costs ?6 to Victoria Coach Station, and taxi - about ?105.
London City Airport is about 15 kilometers away from London city center, which can be easily got by blue Airport shuttle bus - about 25 minutes driving to Liverpool Street Station, ?6 per person, green Airport shuttle bus - about ?2 arriving at Canning railway station, and taxi - about ?20.
Luton Airport is also situated about 110 kilometers away from London City center. You can drive to Luton Airport Parkway Station by Airport public bus and then transit to King Cross Station by Thameslink - the express train if you need. It costs ?9.5 and spends about 35 minutes. The taxi will cost you about ?75.
Euristar is the well known express train operating among the cities of London, Paris, and Brussels via the English Channel submarine tunnel. Tourists can easily transit yourselves between London and Paris which only spends about 3 hours by overland. The time is almost the same as taking a plane.
About 15 express trains are running daily between London and Paris, the first scheduled bus is at 6:29 am, and the last one is at 20:45. It takes about 2 hours and 40 minutes and costs ?154.5 one way.
Additionally there are about 8 scheduled buses running every day, the first scheduled bus is at 19:32, and the last scheduled bus is at 19:32. It spends about 2 hours and 20 minutes and costs ?154.5, too.
The main train stations in London are Victoria Station, Charing Cross Station, Waterloo Station, Liverpool Street Station, King's Cross Station, Paddington Station, and Euston Station.