From the M4:

Leave the M4 at Junction 32 and travel north on the A470, signposted to Merthyr Tydfil. Leave the A470 at the second junction, taking the A468, signposted to Caerphilly. Pass the GEAES plant on the left, and reach a roundabout at the top of the hill. Take the second exit, signposted A468 towards Newport. Coming up to the next roundabout, you will pass a school on the left. Turn left (first exit) at the roundabout, signposted to Abertridwr. The road goes down a dip, and as it comes up again, you will see Bethel Baptist Church on the left - a yellow building with a blue roof. There is a car park to the left of the church.

From Caerphilly centre:

The one-way system ensures that if you are coming from Caerphilly mountain, railway station or shops, you will end up approaching the "Picadilly" crossroads and traffic lights, so named because of the pub opposite you and on the left. Go straight across, following the sign to Ystrad Mynach. However, immediately after the traffic lights, there is a left turn called Mill Road. Take this road (it takes you behind the "Picadilly" pub) and keep going straight. You will pass a set of traffic lights which allows single lane traffic under a narrow railway bridge, and, a bit further on, you will come to a mini-roundabout, with the Bowls Inn on your right. Turn left at the mini-roundabout, and Bethel Baptist Church is almost immediately in front of you, on the right-hand side of the road - a yellow building with a blue roof. There is a car park to the left of the church.