There is a longer stop-over in Banhrain on your way to Thailand. Take this as an advantage and visit this country to get the feeling of another culture. Please refer below for further details about visa requirements to Bahrain.
In case of booking please look for travel dates within 6th of October and 27th of November 2014. This is based on travel date of your outbound flight to Bangkok, your return flight has to be latest on 25th of December 2014. London and Paris are well connected by many low-cost airlines such as EasyJet. One-way tickets are available already for Ł33/€42.
Booking samples
Paris - Bangkok - London for Ł288 (€363)
Frankfurt - Bangkok - London for €423
Travel date samples
6.- 17.10.
30.10. - 14.11.
11. - 28.11.
19.11. - 5.12.
26.11. - 21.12.
27.11. - 25.12.
Alternative - If you are looking for cheap solution to South East Asia you may also consider to book open-jaw flights with China Southern Airlines. To visit Kuala Lumpur and Bangkok or Phuket is possible from just €380/Ł317!
Visa to Bahrain
Citizens of following countries can obtain a two-week visa at the airport in Bahrain without pre-arrangement: Australia, Austria, Belgium, Canada, Cyprus, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Spain, Sweden, Switzerland, the UK and the USA. It is recommended that you buy an eVisa online in advance (www.evisa.gov.bh). The cost for single entry visa at airport of arrival is BHD 5 (approx €10).
Booking sample of cheap open-jaw flights to Bangkok from Europe for Ł288 below. In this case you would be flying from Paris to Thailand on 5th of November. Your return flight from Bangkok to London would be then on 21st of November 2014.