The blade is marked 'S.Hill & Son',  this is Stephen Hill ^[1],  a Birmingham maker noted between 1830-1849 as 'S.Hill', and as 'S.Hill & Sons' between 1849-1855.

Socket has Lovell's catch and sight notch.  Blade shoulders are of post India pattern style.

(1) British & Commonwealth bayonets by Ian D Skennerton and Robert Richardson,  page 397,  ISBN 0 949749 04 4