Rest Assured Adleborough 1400 Pocket Ortho Super King Mattress
The Rest Assured Adleborough 1400 is a pocket spring mattress with an extra firm feel, handcrafted in the UK.
- Genuinely extra-firm support
- Fibre top softens the surface
- Minimises partner disturbance
£725
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Rest Assured Adleborough 1400 Pocket Ortho Mattress
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Mattress details
Mattress
Rest Assured Adleborough 1400 Pocket Ortho Mattress
Size
Firmness
Extra Firm
Construction
Pocket Spring
Orthopaedic
Depth (cm)
26
Layers
2
Layer Details
Comfort Layer
Soft white fibre fillings sit at the surface, which means the extra firm springs beneath don't feel harsh against your body. It's a cosy top rather than a plush one, so expect comfort without much sink.
Support System
1400 individual pocket springs, each encased in its own cloth pocket, adapt to your movement and distribute support to each part of your body. This gives firmer, more localised support than an open coil design, and less disturbance from a partner moving about.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- The most room each: You get 90cm each for two people sharing, which is 15cm more per person than the UK king and means far fewer elbows in the night.
- Width and springs working together: Individually pocketed springs limit how far a partner's movement travels, and the extra width puts more mattress between you, so a restless sleeper disturbs you less.
- Space for small visitors: When a child climbs in or a large dog settles down, the extra firm feel means little sink, so nobody slides towards the middle and everyone keeps a share.
- Full length for taller sleepers: At 200cm long, the UK super king matches the UK king and is 10cm longer than the UK double, which helps if either of you is tall.
- In proportion in a large room: In a period property or a generous master bedroom, a 6ft x 6ft 6in bed fills the space properly where a smaller one can look a little lost.
This size suits you if...
You share with a partner who tosses and turns, your children or dog regularly end up in the bed by morning, and you both like a genuinely firm feel. Your bedroom should also clear our suggested minimum of 3m x 2.9m, with space left for the door to swing.
Consider another size if...
Your bedroom is tighter than 3m x 2.9m, or you sleep alone most nights. We'd recommend the UK king instead, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
Is the Adleborough 1400 super king big enough for two adults and a child?
For occasional visits, yes. The UK super king measures 180 x 200cm, giving two adults 90cm each before a child arrives, so a small sleeper can fit between you without anyone ending up on the edge. The extra firm feel keeps the surface fairly level, which helps stop a child rolling into you.
Adleborough 1400 super king vs king: how much extra room do you get?
The UK super king is 30cm wider than the UK king, and the two sizes are the same length. For a couple, that works out at 15cm more each: 90cm per person on the UK super king against 75cm on the UK king. Room needs differ too: we suggest at least 3m x 2.9m for the UK super king and 2.7m x 2.9m for the UK king.
Will a super king Adleborough 1400 stop me being woken by my partner?
It should help. The pocket springs respond individually, so movement spreads less across the bed, and the UK super king gives each of you 22.5cm more width than the UK double. Distance matters a lot with a genuinely restless partner. No mattress removes disturbance completely, but this combination gives you a good chance.
Will the Adleborough 1400 super king fit in my bedroom?
We suggest a room of at least 3m x 2.9m for a UK super king, and closer to 3.5m x 3.2m if you want space to move around comfortably. Before ordering, check that doors and wardrobes can open fully once the bed is in, and that you can walk round both sides.
What size is the Adleborough 1400 super king in feet?
The UK super king is 6ft x 6ft 6in, or 180 x 200cm. It's worth measuring your landing turns and door frames against that footprint before you buy, because a single-piece mattress this wide can struggle on narrow or twisting stairs. It's the only size of this model that needs super king sheets and a 260 x 220cm duvet.