When is Mother's Day celebrated in Britain?

Mothering Sunday, the UK version of Mother's Day, was 3 April 2011. The date varies a little from year to year.

For example:

2016 - March 06

2015 - March 15

2014 - March 30

2013 - March 10

2012 - March 18

2010 - March 14

2011 - April 03