The LB&SCR got an act passed in 1864 for the Ouse Valley Railway which would leave the Brighton Main Line just south of Balcombe Viaduct and cut across to Uckfield and then on to Hailsham, already on a branch from Polegate. In 1865 an act was passed for the St Leonards Railway to run from a few miles north of Hailsham to what became St Leonards West Marina. Some work was done, but the crisis following the collapse of Overend, Gurney & Co. in May 1866, probably combined with the realisation that the line would probably never be truly competitive with the 10 mile shorter SER route, led to the whole project being abandoned.