I've only just seen this because have been busy for a few days, but am glad I have because I too am descended from Hugh and his daughter Catherine Lewis. I've found all the info' you have and have a lot on Catherine, though not her Christening date because she was born in Manchester and I haven't had the opportunity yet to search all the records there. However, I know a lot about her from then on! I'd love to hear from you and will let you have whatever I have re Catherine and her husband Thomas Preston etc.
I too was delighted to find out about Hugh's army career at the Battle of Waterloo. I think he may have re-married and moved to Liverpool after his wife died. To be checked...
Sorry ... no time for any more now.
Best wishes, Jo