well, as others will say,

>"H. Slater Maker Olerkenwell London".

would be Clerkenwell in the grand old City, and a quick search reveals

H SLATER Meredith Rd. Clerkenwell London (1873 - 1877) Gunmetal, Steel
soled Bullnose Plane (click for photograph), Rosewood wedge.
Approximately 3 3/4" x 1" wide; 1" wide W Marples & Sons Cast Steel
blade, approximately
3/4" remains, shoulder to edge. Tight mouth. An attractive little plane,
  with much original finish, however the gunmetal has a small bruise on
  the nose and on the top of the casting there are a number of small
  knocks or dimples. Nonetheless, a very useful, crisp, little plane.
  G+. 275.00 pounds

the pic link resolves to http://www.trindersfinetools.co.uk/t583.jpg

Richard Wilson Busy doing other things really. . .

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