Newton and Beddome
We have had this piece of research before. It is Michael Haykin's and is found in his pieces on Beddome in the BPBs volume (167) his biography of Sutcliff, One heart and one soul, John Sutcliff of Olney, his friends and his times, 118-120, etc. The actual source is the diary of John Newton (1725-1807) kept at Princeton University. The entries are for June 27, 1775 and August 7, 1776.
In 1775 Newton heard Beddome on 2 Corinthians 1:24. The sermon "gave me a pleasure I seldom find in hearing. It was an excellent discourse indeed, and the Lord was pleased to give me some softenings and relentings of heart." Presumably Beddome was preaching in Olney.
The 1776 occasion was when John Sutcliff (1752-1814) was ordained to the Baptist church at Olney, Buckinghamshire. Beddome did not take part but was present and was prevailed upon to preach in the evening. He preached on Zechariah 11:12. John Newton, then vicar of Olney, wrote ‘He is an admirable preacher, simple, savoury, weighty’.