Harrison Spinks Westminster 15750 Mattress
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Mattress
Harrison Spinks Westminster 15750 Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
32
Layers
4
Layer Details
Top comfort layer
An Egyptian cotton and flax blend that wicks away excess moisture, which means you're less likely to wake up feeling clammy. Both are naturally breathable fibres.
Mid comfort layer
Egyptian cotton, kapok and alpaca wool work together to regulate temperature. In practice that means a cooler feel in summer and a cosier one in winter.
Viscose wool layer
A viscose wool blend derived from the wood pulp of eucalyptus, beech and pine trees. It helps regulate temperature and promotes airflow through the mattress.
Spring system
At the centre sits a layer of Cortec pocket springs with four layers of micro springs and micro ultra springs. Layered springs like these respond to your body in finer detail than a single spring unit, so support feels more tailored.
Layer details from mattressnextday.co.uk product page, September 2026.
- Fits compact rooms: At 90cm wide it slots into box rooms, loft conversions and rooms where a desk and wardrobe are competing for floor space.
- Full spring count in a small footprint: The listed 15,750 springs respond to one sleeper in fine detail, which means support follows you as you shift rather than pushing back broadly.
- Breathable for a single sleeper: Egyptian cotton, alpaca wool, kapok and hemp wick moisture and keep air moving, useful for teenagers and adults who run warm at night.
- A serious guest bed: In a spare room that doubles as an office, it gives visitors a Medium Firm, traditionally made mattress rather than the usual afterthought.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm single duvet fit, and both are the most widely stocked and affordable bedding of any UK size.
This size suits you if...
You sleep alone and want a natural, sprung mattress that will last, rather than treating a single as a size to economise on. It also suits a teenager's room where floor space is tight, or a spare room you want guests to genuinely enjoy sleeping in. Allow at least 2.1m x 2.8m of floor space and it will fit comfortably.
Consider another size if...
You share the bed, or you're an adult who spreads out at 90cm wide. We'd recommend the UK double instead: it's 45cm wider at the same length, and we suggest a room of at least 2.6m x 2.8m for it.
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How big is the Westminster 15750 in a UK single?
It measures 90 x 190cm, which is 3ft x 6ft 3in. That's the standard UK one-person size, so it fits any single bed frame and takes standard single bedding without any hunting around for unusual sizes.
Will the UK single Westminster 15750 fit a bunk bed or mid sleeper?
The width and length match standard bunk frames, but the depth is the thing to check. This mattress is 32cm deep, which is more than many raised frames allow: guard rails need to sit well above the mattress surface. Check your frame's maximum mattress depth before buying, as most bunks are designed for something slimmer.
Is the Westminster 15750 UK single a good choice for a child?
The natural fibres and breathability are appealing for a child's room, and the Medium Firm feel offers solid support. Two caveats: lightweight sleepers may find it slightly firmer than they'd like, and it's a significant spend for a bed a child may outgrow. For a teenager likely to use it for years, the case is stronger.
Is a UK single big enough for an adult on this mattress?
For one adult sleeping alone, yes: 90cm of width is the standard one-person allowance, and the pocket springs respond to a single sleeper's movements closely. If you tend to spread out or share even occasionally, the UK double is 45cm wider at the same length and would suit you better.
What room size do I need for a single Westminster 15750?
We suggest allowing at least 2.1m x 2.8m of floor space, which leaves room to walk around the bed and open drawers or wardrobe doors. That makes it workable in box rooms, loft conversions with a narrow flat section, or a child's room where the bed shares space with a desk and toy storage.