My mum has been going through lots of old photos she's collected over the years and scanning them in. This one is of my great great grandparents, David and Sarah Lancaster. David was born in 1844. I'm not sure how old they are in this picture - the austere dress makes them look older than they probably are.
They lived in Gamlingay, a village in Cambridgeshire, situated between St Neots and Biggleswade. Its current population is around 3,500. Wikipedia has a wealth of information, including the gem that by the year of 1844 there were 5 inns in Gamlingay. They moved to Eaton Socon some time before my great grandad was born, so could well have been living there when this picture was taken. They had a baker's shop in St Neots.