I searched and found them in the 1861 census as you'd mentioned in the chat, however the address was eluding me as I searched on current maps of St Pancras. I found the record with the help you provided, so thank you very much. They lived at 60 Mecklenburgh Street in St Pancras. (You are right, the handwriting is hard to read.)
Thanks so much for your help, Tricia.