In 1901 there is a John Macdonald, aged 45, b. Bedale, Yorkshire, widower, living at 19 Seymour Mews, London (St. Marylebone district), occupation Domestic Butler.
In 1891 there is a John Macdonald, aged 34, b. Catterick, Yorkshire, said to be single, living at Cadwell Hall, Lincolnshire, occupation Butler.
Not sure if you have this:
1871 4817/76/36
Albion Road, Scarborough
John Mackdonald, 18yrs House Servant, b Castlebar, Ireland
In a large household with a variety of servants.