It’s long gone of course but I did find the location for my own peace of mind. It’s just east of the Blenheim school on the same side of the road.
This picture shows the cake house, the only remainder of the Blenheim church. The church itself was removed to Laidley where I understand it was reused as the church hall. Today the Laidley church is up for sale being too small for the congregation. The buildings are in poor condition I am told and are unlikely to remain once sold owing to the likely cost of repairs.