Thmyl Lbt Jyms Bwnd Llandrwyd Mn Mydya Fayr <Reliable · Pick>

thmyl → gsnbo — no. Test shift of -3 (common in puzzles):

Better pattern: maybe it’s : each key pressed one key to the left on QWERTY. thmyl lbt jyms bwnd llandrwyd mn mydya fayr

Shift of -5:

t (20) ↔ g (7) h (8) ↔ s (19) m (13) ↔ n (14) y (25) ↔ b (2) l (12) ↔ o (15) thmyl → gsnbo — no

y → i or e a → unchanged? f → f? r → r. So fayr = f a y r → f a i r = fair. Works. mydya = m y d y a → m e d i a = media. Works perfectly: y→e and y→i? That’s inconsistent unless y maps to both e and i — impossible for simple substitution unless one plaintext letter maps to two ciphertext letters (unlikely). f → f

So maybe not Welsh plaintext. thmyl — could be ‘the mill’? t h m y l → remove h, thmyl → ‘themyl’? No. If th = voiced th (as in ‘the’), m y l = ‘meal’? ‘the meal’? But missing e.