Hello legless, Have a look at http://www.careinthecountryside.net they have 7 properties listed under Cumbria. The only problem you may find with self catering cottages is some of them don`t do short breaks only weekly stays. Best of luck!

http://www.accessatlast.com
has 3 properties in their cumbria section

Irton in the lakes (Self Catering)
Cockermouth

Irton is set in 240 acres of pasture and woodland and commands probably one of the finest views to be found in the Northern Lakes. There are 5 cottages, all with level access showers.



The Bark Cottage (Self Catering)
Lowick Green

The Cottage is a self contained two bedroom apartment, comprising the whole of the bottom floor of what used to be the barn of the old Lowick Tannery.



Deloraine Holiday Homes (Self Catering)
Windermere

Deloraine Holiday Homes is situated in the heart of the beautiful Lake District. This spacious Edwardian country house and Lakeland Cottage stand secluded above Lake Windermere in 1.7 privately owned landscaped acres. Birch cottage has a level access shower.

You would have to click on the links on the site.
I know a friend stayed at Lindeth Howe hotel which he said was lovely.
Alison