BEST TIME TO GO
Start from India in April as it is dry in Myanmar and as by the time you would cross China and reach the mountains of Kyrgyzstan the snow would have melted.
PASSEPORT(Passport in French)
You would need an Indian passport with atleat one year expiry date and many empty pages as you would be crossing many countries in these 50 daysss...
You would be needing tourist visas for Myanmar, China, Kyrgyzstan, Uzbekistan, Kazakhstan, Russia, Schengen and United Kingdom.
INVITATION LETTER AND PERMIT FOR CENTRAL ASIAN COUNTRIES
Kazakhstan, Kyrgyzstan, Uzbekistan require special invitation letters and permits for travel assistance and border crossing.
A reliable agent should be identified who could ship your vehicle back to India once you reach UK.
In addition to travelling fee you would need some extra cash in different currencies and debit/credit cards that can be used internationally during your travel.
Along with this you would need an international driving permit issued by automobile association of India, a vehicle, a carnet - which is like a passport for you vehicle and is issued by automobile association of India. Without a carnet the vehicle cannot leave India. Motor insurance is a must for every single country between India and UK. Global travel insurance to cover you in case of accidents or other extreme unseen conditions.
It's intelligent to carry extra medicines - if you suffer from any illness, first-aid, spare parts for the car. You must have original registration certificate of your vehicle as well as a pollution certificate. Special overland permit is required in Myanmar which takes a month and in China that requires at least three months. Also escort vehicle is required in Myanmar throughout your trip in Myanmar. Also in China you would need a government recognized guide who would travel with you throughout in China.
**Now days many travelling companies provides you with road trips across countries at discounted rates with inclusion of all the required documents mentioned above. You can also contact them for guidance.**
Travelling is always a fun. Never stop travelling as the best chances in life comes when you are on a move, so travel to avail them.