By Train:
From Bath Spa train station, turn left (as you're coming out of the station) and walk along this road for 100 yards or so. There's a big building site on your right (the Southgate development), and when you get to the edge of that, turn right (up past BCH Camping, a Chinese restaurant, and MacDonalds' on the right). The picture on the right shows the road (bearing in mind the Boots on the right is now a building site). Follow this road straight on (not left) up St James's Parade.
By Bus:
Once you get off the bus, follow the direction of the traffic (it's all one-way) for 50 m or so (North / East, with your back to the sun in the early-afternoon) until you get to a T junction. Where you see the view shown in the picture to the right, turn left into St James's Parade.
From the Hobgoblin:
Go straight up St James's Parade, pass the Hobgoblin pub on your right, and continue straight on up the main road. Pass the Odeon cinema on the left, and at the junction at the end of the road (see photo below left), turn right. After 50 yards or so, take the next pedestrian turning left, into New King Street (see photo below right).
The Percy Community Centre is 50 yards on your right:
Click on any of the pictures for a larger version.