This window and the other windows in the Lady Chapel are from the London studio of Charles Eamer Kempe. The two central lights show the scene of the Annunciation. To the left, the Archangel Gabriel kneels, his right hand raised in blessing, and the legend reads in abbreviated form Ave Maria gratia plena - Hail Mary full of grace. Mary, kneeling humbly before the angel, replies Ecce ancilla Domini - Behold the handmaid of the Lord. And the words in the open book that she is touching are from the Magnificat: Exultavit cor meum - My heart has rejoiced.  

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In the left-hand light stands Moses, red-robed and patriarchal, bearing in his hand the two stone tablets of the Ten Commandments. The text reads Prophetam suscitabit vobis Dominus Deus vester de fratribus vestris tamquam me - The Lord your God will raise up for you a prophet like me from among your brothers (Acts 3:22, Deuteronomy 18:15). The skin of his face was shining when he came down from Mount Sinai (Exodus 34:29-35), and that radiance is represented here by two rays of light striking his forehead. 

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The right-hand light shows King David, royally robed and crowned, with harp and sceptre. The words of the scroll echo the Vulgate version of Psalm 2:7: Dominus dixit ad me filius meus es tu ego hodie genui te - You are my son, today I have begotten you. 

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The window as a whole thus shows how the coming of Christ is foretold - by prophet, psalmist and angel. 

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The copper panel beneath the window records the dedication "To the glory of God & in memory of Thomas Snow of Belmont in this Parish. Born 1749 Died 1832. Also of his wife Margaretta and his daughters Sophia, wife of Admiral Bond, Juliana, Lavinia & Marianne Snow." A marble plaque in the north transept, a relic of the earlier Georgian church, tells us that the "Eastern Window" of that church was similarly dedicated. The window was removed to the church of St Thomas the Apostle in Cowick Street.