Isaac Guthrie is the father of John Pritchard Guthrie, William John Guthrie and Hannah Guthrie.
Hannah's baptism records in 1829 show that Isaac was "a Gentleman".
He was also baptised at the same time as his daughter and his parents were noted as William Guthrie(a tailor) and Eleanor Guthrie of Clerkenwell.
Isaac's abode in 1829 was said to be in the Parish of St Mary, Finchley, Whetstone, Middlesex.
Daughter Hannah married into a wealthy family named "Farley" and later moved to Australia.
Sons, John and William, travelled to New Zealand.
I am unable to ascertain what happened to Isaac and his wife Hannah.
I have found Hannah on the 1841 census with her father Richard Bullcock and two siblings, but have had no luck determining where and when Hannah and Isaac died.

Can anyone help?

I believe that Hannah Bullcock was descended from Robert Bullcock (a former deputy of Bishopgate Ward) and Hannah White on her fraternal side and from Richard Budd esq and Ann Rogers on her maternal side.