Fitted sheet and fitted mattress cover

[Justtoobad]

Help, I need a fitted sheet that stays fitted. And a fitted mattress topper that stays fitted.
I'm fed up of both coming off, especially as DH is a walruses.
I want elastic all the way round, I've a superking bed.
Any ideas?

All ours come from John Lewis - no problems with them coming off - but not elasticated all round - just the corners.

I've bought expensive ones but still they come off...so I thought, elastic all the way round?