Likewise, 20 minutes drive from me in SE Essex.
They are located on the edge of the picturesque village of East Hanningfield.
Whilst you can indeed drop in to get a feel of what is on offer, makes sense to check in advance particularly if you are travelling a distance.
I have not had a custom made bat from them, though.
The village pub is worth a visit
http://www.thewindmilltavern.co.uk/as is the Crouch Vale Brewery, a few miles away in South Woodham Ferrers.
http://www.crouchvale.co.uk/