[4] Warlock's dam, Elphine (1837 – 1857), was sired by the 1823 Derby winner Emilius and was bought by Lord Durham in 1850.

A chemist by trade, Nichol also purchased The Wizard from Lord Durham and won the 1851 St Leger with Newminster.

At Carlisle, he was beaten by Fisherman for the Cumberland Plate after he was accidentally slowed by his jockey, George Fordham, after the first lap.

At York, Warlock won the Great Ebor Handicap, beating Merin (sired by Birdcatcher) and six other runners.

[11] The 1856 St Leger was run on Wednesday, September 17 with a field of nine horses, including the Derby winner Ellington, Bonnie Scotland, and Artillery.

Ellington was favored to win the race, but Warlock won easily by two lengths, the Derby winner ultimately finishing unplaced.

[2] Retired to stud in 1859, Warlock first stood at Kirby Farm in Tadcaster for a fee of 10 guineas each mare bred.

[15] Warlock's only son to continue the sire line was Tynedale, which was third to Achievement and Hermit in the 1867 Doncaster Cup.

While not considered a successful sire, Warlock does appear in modern Thoroughbred pedigrees due to the influence of his daughter Fairy (1860 out of Leila by Melbourne), who is the dam of the mare Jenny Diver.