Silentnight Memory 1400 Mattress
Mattress
Silentnight Memory 1400 Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam. The top layer moulds to your body as you settle in, which means pressure is eased away from your muscles and joints. You should feel gently cradled rather than pushed back against.
- Mirapocket springs. Beneath the foam sit 1400 Mirapocket springs that respond independently to your every movement. In practice, that means support where you need it and better spinal alignment, with less motion carrying across the bed.
Layer details from silentnight.co.uk product page, September 2026.
- Room to sleep apart, together: With 75cm each for two people sharing, you can both spread out without negotiating territory every night.
- Springs that keep the peace: The 1400 Mirapocket springs move independently, so a partner leaving for an early shift is less likely to wake you across this wider surface.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, a real difference if either of you is approaching six foot.
- A firm feel that suits shared beds: The extra firm build keeps the surface stable edge to edge, so neither of you rolls towards the middle.
- Fits most master bedrooms: We suggest allowing at least 2.7m x 2.9m, which most UK master bedrooms can manage with bedside tables on both sides.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, or one of you keeps odd hours and the movement wakes the other. It also suits couples where one partner is tall, since the 200cm length removes the dangling-feet problem, and anyone whose dog has claimed a permanent spot and left you both with less mattress than you paid for.
Consider another size if...
Your bedroom can't comfortably give up 2.7m x 2.9m of floor space, or you sleep alone and the width would go unused. We'd recommend the UK double instead, which needs a smaller room at 2.6m x 2.8m.
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Is a UK king big enough for a couple on the Silentnight Memory 1400?
Yes, comfortably for most couples. You get 75cm each for two people sharing, and because the 1400 Mirapocket springs respond independently, one person shifting or getting up early carries less movement across the bed. Restless couples who want still more room could consider the UK super king, which is 30cm wider.
How much bigger is the king Silentnight Memory 1400 than the double?
The UK king is 15cm wider than the UK double and 10cm longer, at 150 x 200cm against the double's 135 x 190cm. The extra width is what most couples notice night to night, while the extra length matters if either of you is tall.
Will the king size Memory 1400 fit my bedroom?
We suggest allowing at least 2.7m x 2.9m for a UK king, which leaves walking room and space for bedside tables on both sides. New build master bedrooms often look bigger than they are once wardrobes go in, so measure the usable floor rather than the room on the plan.
Is the Silentnight Memory 1400 long enough for someone over six foot?
The UK king is 200cm long, or 6ft 6in, which gives a sleeper over six foot genuine clearance rather than feet at the edge. That's 10cm more length than the UK double, and it's often the length rather than the width that makes the upgrade feel worthwhile for taller couples.
Where can I buy the Silentnight Memory 1400 in a UK king?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so it's worth checking back if you're not buying today, as stock and pricing on the UK king can shift between feeds.