Do you have a record in England saying Patrick was born in Co. Sligo? You need some more facts from England before you can attempt to get information in Sligo:
a) Dates of birth for Patrick and his wife if you're interested in also researching his wife's family.
b) Patrick's parents names.
c) Patrick's place of birth in Sligo, eg. town/townland, civil or religious parish. There's a list of the names of all the towns and townlands in Co. Sligo at the Ireland Townland Database http://www.seanruad.com
and select Sligo as your search county.
There are no surviving census records before 1901. Church parish registers for Patrick's birthplace in Sligo would be the possible source for a baptismal record for him. The difficulty is that many church parish registers either don't survive or don't go back far enough to include a baptismal record for him. You also need to find out what his religious denomination was.
Here's a link to the entries for Wimseys in the 1901 census in Sligo. There was huge emigration when Patrick left during the Irish Famine in 1847, also known as Black 47, for the huge numbers of deaths which occurred in Sligo and Ireland. There was huge emigration all during the nineteenth century subsequent to the Famine right into the twentieth century. So the numbers and locations of Wimseys in the 1901 census wouldn't be reflective of all Wimseys in Sligo or Ireland.
You also don't mention of Patrick emigrated with children.
You need to research Patrick's civil and church records in England to find out the answers to the questions I noted above so you can research the surviving information in his birth location in Co. Sligo. His civil and church death records, cemetery record, tombstone, will, obituary and England census records are all sources to find his specific birth location in County Sligo and his parents hames.