I too have a link to Benjamin Lusk of Bristol, England. Benjamin Burton Lusk married Sarah Thomas at St James, Bristol on 10 Nov 1816. His son James Burton Lusk married Eliza Gay at St Thomas, Bristol on 10 Sep 1843. His son, James George Lusk (b 1844) married into my family (Harriet Bryant) in 1868. They subsequently emigrated to Australia in 1886.
I too am seeking further info on Benjamin Lusk. I have located him on the 1851 census in Bristol where his place of birth is given as Bristol. I have found a death entry at Glossop, Derbyshire in 1860 ino Benjamin Burton Lusk aged 73.
If you would like to contact me off forum I can email you copies of the 1851 census for both Benjamin and James Lusk. Regards Jim