Bradfield Brewery is based on Watt House farm at High Bradfield and is close to Nags Head and Old Horns pub.
You will find about 9 of the Bradfield ales in The Nags Head pub, and all of them just at £2.00 a pint. Plus they also do amazing food with a beer garden to sit outside in.
You can get to the brewery on the 61/62 bus from Hillsborough, operated by TM Travel.
A list of their permanent ales can be found on this page.
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.
There is also a list of seasonal ales here, none of them I have managed to find.
They also have their own shop, so you must go and pay a visit, you can buy absolutely anything from there, a great section.
Bradfield Brewery Ltd
Watt House Farm
Tel: 0114-285 1118
Here a google map to find the brewery.