How many times since 1900 has the UK been in a recession?

How many times since 1900 has the UK been in a recession?
I would like to know how many times in the past 100 years the UK has been in a recession; recession being a decline in Gross Domestic Product (GDP) for two or more consecutive quarters.and a reference to any info if you have it, i found some text on the telegraphs website but it didnt clearly state if the 4 dates given were 2 concetitive falls in GDP: 1948, 1978, 1981, 1992 were the 4 dates given.  Please expand I would like to know how many times in the past 100 years the UK has been in a recession; recession being a decline in Gross Domestic Product (GDP) for two or more consecutive quarters. and a reference to any info if you have it, i found some text on the telegraphs website but it didnt clearly state if the 4 dates given were 2 concetitive falls in GDP: 1948, 1978, 1981, 1992 were the 4 dates given.  Please expand I would like to know how many times in the past 100 years the UK has been in a recession; recession being a decline in Gross Domestic Product (GDP) for two or more consecutive quarters. and a reference to any info if you have it, i found some text on the telegraphs website but it didnt clearly state if the 4 dates given were 2 concetitive falls in GDP: 1948, 1978, 1981, 1992 were the 4 dates given.  Please expand