I have found the booklet about Llangelynin church. This is a quote, which also mentions a church at Rhoslefain: -
"... Another new church, this time at Llwyngwril, was built in 1842. Yet another church , much smaller, appeared at at Rhoslefain in the late nineteenth century, and Fairbourne acquired a substantial stone church of its own in 1927.
The church at Llwyngwril effectively replaced the old church on the cliff which was already, by 1842, inconveniently removed from the centre of population. Thereafter, the old church was used only for occasional burials. It was virtually abandoned for some seventy years and became severely decayed. It was preserved by careful restoration in 1917 and further work in 1972 ..."
There is an annual service held there, in August, and was licenced again for marriages in 1972.
Each pew carries the name of a land owner and his properties. Ty-croes is the only one which seems not to carry the owner's name. Castell Fawr was owned by Griffith Jones.
The attached extract from a photograph shows the Ty-croes pew.