I have 3 washable bed pad for a double bed. They are used but washed.
https://www.ageukincontinence.co.uk/vivactive-washable-bed-pad-blue-with-tuck-in-sides-5000ml-king-size.html
Let me know if your interested
Washable bed pad for double bed *3 (Crookesmoor S6)
This offer has been gifted to someone and is no longer available.