Woolly tights with shaped heel for 6 yo girl - which department stores?

[Shitemum]

DD1 hates woolly tights that have a seam across the toes but no heel...you know, the ones that bag and wrinkle round the ankles.

I have exactly an hour on Monday to go up town and buy her some before boarding the plane back to where we live...where tights are more expensive than here...!

Which big stores have a good selection of plain colours?

Thanks!

[Earlybird]

John Lewis/Peter Jones.