« Reply #3 on: Saturday 01 December 12 04:03 GMT (UK) »
I've got membership of the British Library to view the online newspapers and unfortunately there's no mention of your jockey either as "Cotter" or Cottar" - initially I was quite hopeful because I got several "hits" but they all referred to people living in cotters/cottars.
Coincidentally I was searching through the newspaper archive a few days ago for an ancestral surname and the several hits I had were for the owner of winning horses, there were no jockey names only the horses names.
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Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke