Waktu Musim Panas British

Masa musim panas berganda

Sewaktu Perang Dunia II, Britain mengekalkan kemajuan jam pada GMT di permulaan musim sejuk pada 1940 dan berlanjut memajukan jam dengan satu jam tambahan hingga Julai 1945. Sewaktu musim panas ini Britain oleh itu memajukan 2 jam hadapan GMT dan mengoperasikan pada British Double Summer Time. Jam ini telah dikembalikan ke GMT pada akhirnya musim panas 1945. Pada 1947 jam-jam telah dimajukan sebanyak satu jam dua kali sewaktu musim bunga dan diletakkan dua kali sewaktu musim gugur supaya Britain berada di BDST sewaktu puncak musim panas.

Bantahan

Perdebatan occasional meletus ke atas validity of BST, oleh kerana Britain's latitudinal length. Pada 2004, suatu penyumbangan menarik telah dilakukan oleh AP Inggeris Nigel Beard, yang menjadualkan suatu Bil Ahli Swasta di Dewan Rakyat mencadangkan bahawa England dan Wales seharusnya menentukan waktu mereka berdikari dari Skotland dan Ireland Utara. Jika ia telah diluluskan ke dalam undang-undang, bil ini akan secara berpotensi telah melihat United Kingdom dengan dua zon waktu berlainan pada waktu pertama sejak pembubalan Waktu Min Dublin (25 minit mundur Greenwich) on 23 August 1916.
Sestengah gerakan akar-rumput bermuncul untuk pembubalan BST secara keseluruhannya, menggemarkan GMT sepanjang tahun. Mereka biasanya menyatakan kekurangan keuntungan praktikal dari pengubahan waktu, selain itu mooting bahawa pengubahan jam sekolah dan/atau bisnes akan mengesankan perubahan yang sama tanpa gangguan piawai saintifik.

Waktu Musim Panas tunggal/berganda

Safety campaigners, including the Royal Society for the Prevention of Accidents (RoSPA), have made recommendations that British Summer Time be maintained during the winter months, and that a "double summertime" be applied to the current British Summer Time period, putting the UK one hour ahead of GMT during winter, and two hours ahead during summer. This proposal is referred to as "Single/Double Summer Time" (SDST), and would effectively mean the UK adopting the same time zone as central European countries such as France, Germany, and Spain (Central European Time and Central European Summer Time).
RoSPA suggest this would reduce the number of accidents over this period as a result of the lighter evenings, as was demonstrated when the British Standard Time scheme was trialled between 27 October 1968 and 31 October 1971, when Britain remained on GMT+1 all year. Analysis of accident data during the experiment indicated that while there had been an increase in casualties in the morning, there had been a substantially greater decrease in casualties in the evening, with a total of around 2,500 fewer people killed and seriously injured during the first two winters of the experiment. RoSPA have called for the two year trial to be repeated with modern evaluation methods. The proposal is opposed by farmers and other outdoor workers, and many residents of Scotland and Northern Ireland, as it would mean that, in northern Britain and Northern Ireland, the winter sunrise would not occur until 10:00 or even later.
In 2005, Lord Tanlaw introduced the Lighter Evenings (Experiment) Bill into the House of Lords, which would advance winter and summer time by one hour for a three-year trial period at the discretion of "devolved bodies", allowing Scotland and Northern Ireland the option not to take part. The proposal was rejected by the government. The bill received its second reading on 24 March 2006; however, it did not pass into law.  The Local Government Association has also called for such a trial.