These birth registrations look like the two Butt children but wrong mmn.
BUTT, HENRY       mmn PERRYMAN     
1847  Sept Quarter in THE ISLINGTON DISTRICT  Volume 03  Page 218
BUTT, CHARLES  RICHARD     mmn PERRYMAN     
1849  Dec Quarter in THE ISLINGTON DISTRICT  Volume 03  Page 254   
This looks like George Hewitts birth  This would give details of his father
HEWETT, GEORGE       mmn PERRYMAN     
1841  Sept Quarter in KENSINGTON  Volume 03  Page 263   
Just adding last child
BUTT, JOHN  ROBERT     mmn PERRYMAN     
1852  March Quarter in THE ISLINGTON DISTRICT  Volume 01B  Page 203