Do I need a transit visa for a cuban in transit with a stopover of couple of hours without leaving transit area enroute Havana to London?
If you have a UK visa you can transit without a visa according to Timatic (the database used by airlines):
Transiting without a visa is possible for:
Nationals of Cuba with a normal passport transiting through Paris (CDG), arriving from a non-Schengen Member State with a confirmed onward ticket for a flight within 24 hours to a third country which is not a Schengen Member State. They must:
- have a visa issued by Bulgaria, Canada, Croatia, Cyprus, Ireland (Rep.), Japan, Romania, USA or United Kingdom, and
- stay in the international transit area of the airport, and
- have documents required for their next destination.
Note: Neither Cuba or UK is a Schengen Member State so this guidance applies.