British Standard Time
In 1968 an experiment was tried. The clocks were put forward and not put back again until October 1971, keeping the UK on GMT+1 for three years.
It was called British Standard Time, presumably because calling it British Summer Time all year round seemed silly.
Nobody could really tell if it had a positive effect though, so parliament voted to get rid of it in 1970.
Several members of parliament have since tried to reintroduce British Standard Time, but none have succeeded.