Competition is at the heart of British Tennis.
Tennis competition age groups are determined by the age of a player from 1st January, so for example to compete in a 12U competition from 1st September 2009 you must be born in either 1998 or 1999.
At the moment, due to the winter season starting in September, players move age groups at the end of the summer season. This means players compete in the same competition age groups against the same players for the whole of the winter season.