Single bed flat sheets (Bursledon SO31)

Ho does anyone have any Single bed flat sheets i can have please?

Not fussed on colour or light staining. My dads having palliative care at home, countesses mount batten have kindly provided a hospital style bed with ripples to stop bed sores but its an odd size and single fitted sheets from our childhood dont fit, currently using double bed sheets overly tucked in but as we have to wash them almost daily, sometimes twice its taking up a lot of washing machine space. As are the duvet covers.

Thinking if we can get a flat sheet above and below it will mean we can fit a couple in a normal load and not have to run the machine so oftern