Rest Assured Adleborough 1400 Pocket Ortho Single 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
£395
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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
- Leaves floor space for everything else: At 3ft x 6ft 3in, the UK single leaves room for a wardrobe, desk and toy storage in a child's bedroom where a double would fill the floor.
- Firm support for growing teens: The 1400 pocket springs react to each part of the body separately, which means a heavier teenager gets steady support rather than a sagging middle.
- Two beds in one spare room: Two UK singles side by side let a guest room sleep friends or siblings who would rather not share, with a walkway left between them.
- Fits under a sloping ceiling: The narrow 90cm width lets you tuck the bed along the low side of a loft conversion, where a wider mattress would push into the headroom you need.
- Suits a room with two jobs: In a spare room that doubles as a study, a UK single keeps most of the floor free for a desk and chair on the days nobody is staying.
This size suits you if...
You sleep alone and want a genuinely firm mattress, you're fitting out a teenager's room or a student flat where floor space is tight, or you need two separate beds in a guest room rather than one shared one.
Consider another size if...
You're an adult who sprawls, sleeps with a partner or a pet, or wants more room to turn over. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Adleborough 1400 UK single a good mattress for a child?
It depends on the child. The UK single is the right size for a child's room, but this mattress is extra firm, so a lightly built younger child may find it too hard to sink into, especially when sleeping on their side. It tends to suit an older child or teenager with more body weight better.
Can I put the Adleborough 1400 UK single on a bunk bed or mid sleeper?
Check the frame first. Rest Assured lists the depth as 25.5cm, while the dimensions table gives 25cm with a tolerance of plus or minus 2cm. Raised frames usually set a maximum mattress depth so the guard rail still works, so compare that limit with these figures before you order.
How much room do I need for a UK single Adleborough 1400?
The mattress measures 90 x 190cm, or 3ft x 6ft 3in. We suggest allowing at least 2.1m x 2.8m of floor space, which leaves room to walk around the bed and open a wardrobe door in a compact bedroom.
Is a UK single Adleborough 1400 long enough for a tall adult?
The UK single is 190cm long, the same length as the UK double. If you're tall and your feet reach the end, the UK king is 10cm longer, although it's also much wider and we suggest at least 2.7m x 2.9m of room for it.
Should a guest room have one Adleborough 1400 double or two UK singles?
Two UK singles suit guests who won't share a bed, such as siblings or friends, and you can push them together for a couple. A single UK double gives 67.5cm each for two sharing and needs at least 2.6m x 2.8m, so it only works if your guests are usually couples.