I will present the state-of-the-art in weak lensing data analysis, showing the results from  
the ground-based CFHT Legacy Survey covering 150 square degrees to redshifts of 3. Looking towards the future I will discuss the space-based Euclid survey that 
covers 100 times the area of CFHTLenS whose aims are to determine the nature of dark energy, dark matter and nature of gravity on cosmic scales; a survey with 
strong MSSL involvement.