Firmness
Type
Pocket Spring
Depth (cm)
32
Number of Layers
4
Trial Period (nights)
Warranty (years)
10
Price Range
£1,499 to £2,849
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress makes most sense if you sleep warm or share a bed. The natural fibre layers, cotton, flax, wools and kapok, are chosen for moisture wicking and airflow, so heat is less likely to build up overnight. The Cortec pocket spring system with micro spring layers gives localised support, which means less motion transfer when a partner moves. Harrison Spinks is an NBF-approved manufacturer and the wool is certified traceable British wool, reassuring if provenance matters to you. It's a big outlay, and there's no memory foam here, so if you like a deep, cradling hug this isn't that. If you want a springy, breathable, traditionally made mattress, it's a strong candidate.
Key Features & what's inside
- 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.
Who's it NOT for?
If you prefer the slow, sinking feel of memory foam, look elsewhere: this is a responsive, sprung feel throughout. Lightweight side sleepers may find Medium Firm a little too firm on the shoulder and hip. And if your budget sits well under £1,499, this simply won't be a comfortable spend.
Harrison Spinks Westminster 15750 Mattress
How firm is the harrison spinks westminster 15750?
It's listed as Medium Firm. That tends to suit back sleepers and most combination sleepers, while lighter side sleepers may find it slightly too firm for comfortable pressure relief at the shoulder.
How many springs does the westminster 15750 have?
The listing states 15,750 springs, made up of Cortec pocket springs plus four layers of micro springs and micro ultra springs. More, smaller springs mean the surface can respond to your body in finer detail.
Does the harrison spinks westminster 15750 come with a guarantee?
The MattressNextDay listing states a Harrison Spinks 10 year guarantee. It's sensible to confirm the exact terms with whichever retailer you buy from before ordering.
What sizes does the westminster 15750 come in?
It's available in UK Small Single, Long Small Single, Single, Small Double, Double, King and Super King, plus EU Single, Double and King. Prices range from £1,499 to £2,849 depending on size.
Is the westminster 15750 good for hot sleepers?
It's a reasonable choice. The fillings, including Egyptian cotton, flax, kapok, alpaca wool and a viscose wool blend, are breathable and moisture wicking, and there's no heat-retaining foam in the listed layers.
Couldn't find an answer to your question? Send us a message