Hello Nicola,
It may be that the maiden name of Mary as has been suggested is Pettler (Petler). The Silton you are looking for is in the parish of Leake (Nether Silton or Over Silton) - east of Northallerton. Marriage to John Laidler 16th Oct 1824, christened at Leake - Jan 1802 to John & Elizabeth Pettler (Petler) (married 1784)- Note the variations of the surname have been common both being used by an individual person.
cheers
Phil