I have 7 Lydia/Lidia Brain's in my Family Tree including Lidia Brain baptised Ruardean 7.7.1781 Ruardean shown here, her parents Christopher Brain & Ann Jelfe had 8 children, including an earlier Lydia baptised 15.12.1771 buried 2.10.1774. However, I think it extremely unlikely that Lydia Brain baptised in 1781 married Charles Walden in 1789, which marriage is shown in this thread.