I have the following copies of the Cumberland 1851 census transcriptions from the CFHS and will do look-ups when I can. To make things easier, try and find the people you are looking for here first http://rolyg.members.beeb.net/CensusNames.htm use the links on the left hand side of the page.
Hensingham and Part 1 of Preston Quarter HO107/2437 Folios 5 - 137 Preston Quarter ( part 2) Rottington, Sandwith, Lowside Quarter and St Bees HO107/2437 Folios 142 - 282
I also have a copy of the Cumberland 1841 Census, but this is not indexed so please try and be specific and give as much information as you can. It usually mean trolling through hundreds of pages of barely legible handwriting.