This is a funny little church in the middle of nowhere. It is still consecrated but it doesn't have a congregation or services. It's looked after by a group called Friends of Friendless Churches (https://friendsoffriendlesschurches.org.uk/) which is nice but sad at the same time. It also means the church was open for me to look at.
It's described as a "Small but perfectly formed church in an ancient circular churchyard overlooking Llyn Padrig (Padrig Lake)." Apparently, it's also "all that remains of an Anglesey town that was wiped out by the plague." The name "Tal y Llin" means "the end of the lake", which it is.
This other photo is one Uncle Les took looking out of the window behind the altar.