Harrison Spinks Canterbury 4450 Mattress
The Harrison Spinks Canterbury 4450 is a medium firm pocket sprung mattress with natural fillings, available in ten sizes from UK Small Single to Super King, plus EU sizes.
- Certified traceable British wool
- Breathes better than foam
- Suits back & combination sleepers
£829
Get the lowest price we've found
The Harrison Spinks Canterbury 4450 combines 4450 pocket springs with micro posture springs, which means support that adjusts to your shape rather than pushing back uniformly. Fillings include British wool, flax, cotton and Ecotex fibres, so it breathes well without synthetic foams. At 27cm deep, it arrives flat rather than rolled, a sign of traditional construction. It comes with a Harrison Spinks 10 year guarantee. One thing to know upfront: the retailer page we sourced mentions no sleep trial, so check return terms before you buy.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
27
Number of Layers
3
Trial Period (nights)
Warranty (years)
10
Price Range
£829 to £1,599
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177, British Wool
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose the Canterbury 4450 if you want traditional craftsmanship. Harrison Spinks is an NBF-approved manufacturer, and the wool here carries Authentic Traceable British Wool certification, which means you can verify where it came from. The natural fillings, wool, flax and cotton, wick moisture and breathe better than foam, so if you're a hot sleeper this construction works in your favour. The medium firm feel suits most back and combination sleepers, although very lightweight side sleepers may find it slightly too firm. Yes, it's a real spend, but 4450 springs plus micro springs and natural fillings justify it. MattressNextDay lists free next day delivery, delivered flat, not boxed.
Key features & layer details
Cover
A breathable Belgian damask fabric cover. It lets air move through the sleep surface, which helps the natural fillings beneath do their temperature work.
Comfort Fillings
Wool, Ecotex fibres, flax and sustainably sourced cotton. The wool gives a soft cushioned feel, the Ecotex fibres are made from 100% recyclable materials, and the flax and cotton are breathable, absorbent fibres that wick moisture away from you.
Support System
4450 pocket springs combined with micro posture springs. Each pocket spring sits in its own fabric pocket and works independently, while the smaller micro springs contour to the exact shape of your body.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Warm sleepers
Wool, flax and cotton fillings wick moisture away and breathe better than foam, so the bed should stay comfortable if you tend to overheat.
Back sleepers
The medium firm feel suits most people who sleep on their back, with pocket springs and micro posture springs shaping support to your body.
Combination sleepers
Medium firm comfort and independently working pocket springs adapt as you change position, so switching between back and side should feel supported.
Eco-conscious buyers
Natural fillings including British wool carrying Authentic Traceable British Wool certification, plus recyclable Ecotex fibres, mean you can choose a mattress without synthetic foams.
Skip this one if you want a boxed mattress you can manoeuvre upstairs alone: it arrives flat, all 27cm of it. It's also not for you if you love memory foam, as there's no foam here at all. And if a lengthy home trial matters to you, the retailer page we reviewed doesn't mention one.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Harrison Spinks Canterbury 4450 Mattress
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Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the Harrison Spinks Canterbury 4450?
It's rated medium firm. That suits most back and combination sleepers, although lightweight side sleepers may find it a little too firm for pressure relief at the shoulder and hip.
Does the Harrison Spinks Canterbury 4450 have a guarantee?
Yes, the product page states a Harrison Spinks 10 year guarantee. No sleep trial is mentioned on the retailer listing we sourced, so check the return policy with your chosen retailer before ordering.
What is the Canterbury 4450 mattress made of?
It uses 4450 pocket springs with micro posture springs for support, topped with wool, flax, sustainably sourced cotton and Ecotex fibres, under a breathable Belgian damask cover. There's no memory foam, which means a more breathable, responsive feel.
Does the Canterbury 4450 come rolled in a box?
No. MattressNextDay states it arrives flat, not rolled and boxed, which is typical of traditionally built sprung mattresses. Make sure your stairs and doorways can accommodate a full-depth 27cm mattress.
What sizes does the Harrison Spinks Canterbury 4450 come in?
Ten sizes: UK Small Single, Long Small Single, Single, Small Double, Double, King and Super King, plus EU Single, Double and King.
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