The site contradicts you because it contradicts itself. Note that the bold text in the second section contradicts the statement in the first section which is what you quoted in the first place. BTW, if you really want to be anal about this the quote is wrong as UK time is UTC + 0 when not in daylight savings and UTC + 1 when in daylight savings. The fact that UTC is always within 0.9 seconds of GMT is irrelevent, GMT isnt a real timezone anymore. Here is an overview
What time zone is
United Kingdom (UK) in?
United Kingdom (UK) is in the Western European Time Zone.
Western European Standard Time (WET) is Greenwich Mean Time (GMT).
United Kingdom (UK) observe Daylight Saving / Summer Time?
Like most states in Europe, Summer
(Daylight-Saving) Time is observed in
United Kingdom (UK), where the
time is shifted forward by 1 hour; 1 hours ahead of Greenwich Mean Time
After the Summer months the time in
United Kingdom (UK) is shifted
back by 1 hour to Western European Time (WET) or (GMT)