Bradfield Brewery is based on Watt House farm at High Bradfield and is close to Nags Head and Old Horns pub and the Brewery Shop is also on the Farm.
You can get to the brewery on the 61/62 bus from Hillsborough, operated by Powells Bus and bus timetable can be found here.
The Farmers Blonde can be found in quite a few pubs in Sheffield, I have seen it many times.
Brown Cow is one of my favourites and is harder to find although recently I did find it in a couple of pubs in Grenoside/Chapeltown.
Pubs : Old Nags Head, Warncliffe Arms, King and Miller. More information about all 3 pubs can be found here.
Here a google map to find the brewery.