Barbadosbelle
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I don't know your age but if you are 'getting on a bit' (and even if you aren't!!) then I very much recommend the fully fitted M&S brushed cotton fitted sheets.
By fully fitted I mean that all four sides are fully elasticated NOT just the fiddly corners. All the way around.
It really helps to make changing the bed so much easier and less exhausting.
I bought the brushed cotton fitted ones a year+ ago and they are really great - cool in summer, warm in winter. Launders perfectly and can go in the dryer. No point in ironing. Different mattress depths available. Ridiculously low price
I bought four in King Size for two beds.
Brilliant.
Very much recommended for a cosy night's sleep.
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Would king size fitted (or superking size fitted) ones do for a mattress that is effectively 13 inches thick (by the time one takes into two mattress toppers on top)?
You better believe JUST how heavy a mattress that thick can be.....agh!