Thank you so much for your response.
Isaac’s abode was listed as Daw Green on the baptisms in Dewsbury (Kirgate in Leeds) and I had seen those land tax records on Ancestry. William Myers was Isaac’s father b.1751 and died 1817 aged 66. Isaac Myers was William’s father and he died in 1808.
Would records for the 15th Regiment be held in Yorkshire or would they only be in Kew?
I will be visiting England next month and staying in Manchester (for family research) and hope to visit Leeds.
I followed up the first son, William, with the hope of finding more about Isaac and Sarah, but this seems to have raised more questions. William and his wife Elizabeth had two sons – Frederick b.1838 and William b.1843. I obtained a pdf of Frederick’s birth and his mother was Elizabeth Richardson (also in the GRO index for William). The only marriage I have found is in 1827, which is very early for these births - William Myers, Widower, otp St.Mary, Lambeth, Surrey, marr. 22 Dec. 1827, Elizabeth Richardson otp, Spinster, Banns, William sgd, Elizabeth x, in presence of Robt. Eyers & Eliz Eyers.
Furthermore, whilst trying to find a Sarah (name unknown) in Trowbridge, Wiltshire, I found Sarah Eyris (Eyers/Eyres) born 1772, bapt. 18 May 1798, age 26, St.James, Trowbridge, Wiltshire to Parents William and Hester. Sarah Eyre, Spinster, otp Trowbridge, marr. 4 July 1796 John Harrison, Bachelor, Trowbridge, by Banns.
Francis Harrison Bapt. 3 Dec.1797, Trowbridge, Wiltshire, John and Sarah Harrison (also Fanny Harrison, born 1797, Bapt.14 July 1811, age 14, Trowbridge, Wiltshire, to John & Sarah).
Sarah Myers was 65 in the 1841 Census, 76 in the 1851 Census and 83 when she died in 1854, suggesting a birth date from 1771 to 1776, which makes her rather old to have had her last child in 1823.
I am hopeful that perhaps you may be able to offer some further insight into all of these potentially possible or just coincidental records.