IIRC they did leave it one year and there was a bus crash in scotland and some kids died, some said it was because it was dark, so then they decided to keep the daylight saving, and it hasnt changed since
....A bus crashes and it being dark is to blame? - That's stupid 
Do more fatal crashes happen during the hours of darkness than of daylight then?
from memory yes, school kids killed, the reasons being if the clocks had changed then the driver would have seen them, will see what i can find to back this up
found this
A move to "permanent daylight saving time" (staying on summer hours all year with no time shifts) is sometimes advocated, and has in fact been implemented in some jurisdictions such as Iceland, Russia, and Belarus.[87] The United Kingdom stayed on daylight saving time from 1968 to 1971.[139] Advocates cite the same advantages as normal DST without the problems associated with the twice yearly time shifts. However, many remain unconvinced of the benefits, citing the same problems and the relatively late sunrises that year-round DST entails.[140]
"Permanent daylight saving time" or permanent summer time are perhaps misnomers, as the practice essentially becomes the "standard time" for the area. However, it can be considered to be a deviation from the internationally agreed timezone of the Coordinated Universal Time system.
Many jurisdictions such as Argentina, Georgia, Kazakhstan, Senegal, Sudan, Turkmenistan, and Tokelau can be considered to use a form of de facto permanent daylight saving time[citation needed] because they use time zones located to the east of the time zones they are geographically located in. Thus their local times are later than the time they would theoretically occur under a "pure" system, such as the nautical time system, giving the same effect as year-round DST.
although no mention of the reason for going back, will look some more
