The UK government currently lists the following dates after which the lamp types listed may no longer be placed on the market:
August 2023
T8 and T5 fluorescent lamps with a lifetime greater than 20,000 hours
September 2023
T8 Linear fluorescent lamps 2ft, 4ft and 5ft Mains voltage halogen capsules with G9 cap 12V halogen capsules with G4/GY6.35 ca
Please note that the following are only the dates for phase out that were known at the time of publishing this article, at present these bans typically affect halogen and T8 fluorescent lamps, however it is likely in future they will be extended to T5 fluorescent lamps and sources such as HID High Intensity Discharge.