My sister and I (both twin mums!) and my family are going to walk 10k on 25 June to raise money for Twins Trust.  Both our sets of twins were born prematurely and the work that the Twins Trust does is invaluable with regards to not only premature birth but TTTS (twin to twin transfusion syndrome) and really importantly, huge support for twin mums and families - from birth to adulthood.  My twins suffered from TTTS during my pregnancy - it was a worrying time, and there was not a lot of information on TTTS to help ease my fears.  I'd love to raise money to help other parents going through a twin pregnancy with TTTS.