best quality sheets and duvet covers?

[spudcounter]

which ones? and where do I buy them from?

IMO White Company.

An investment purchase but they wear really well. I know some hotels use them because they keep going so well.

Yup.
White Company. Mine are as good as new after almost 2 years.

Laura Ashley aren't bad, either.

Agree that The White Company has good quality products and there is sale on at moment.