Harrison Spinks Canterbury 4450 King Size 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
£1,279
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
Harrison Spinks Canterbury 4450 Mattress
More available sizes
Mattress details
Mattress
Harrison Spinks Canterbury 4450 Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Rolled
Wool
Natural
Depth (cm)
27
Layers
3
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.
Key benefits
- Less disturbance when schedules differ: The 4450 pocket springs move independently, so an early riser slipping out at 5am is far less likely to wake the person still asleep on the other side.
- 75cm of space each: Two people sharing get 75cm each, which means you can turn over without negotiating for territory, a real difference if you currently share a UK double.
- Length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, so anyone approaching six foot stops waking with their feet at the edge.
- Natural fillings across a wider surface: Wool, flax and cotton wick moisture and breathe, which helps two bodies sharing one bed stay at a comfortable temperature through the night.
- Micro springs that adjust to each of you: The micro posture springs contour to whoever lies on them, so partners of different weights each get support shaped to their own body.
This size suits you if...
You share the bed every night and have outgrown a UK double, especially if one of you keeps different hours and disturbance is a nightly frustration. It also fits taller couples: the 200cm length gives anyone approaching six foot room to stretch out. And if a dog has quietly become a permanent fixture at the foot of the bed, the extra width stops that costing you sleep.
Consider another size if...
Your bedroom is under our suggested 2.7m x 2.9m minimum, or you sleep alone. For a smaller room shared by two, we'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
Is the Canterbury 4450 UK king big enough for a couple?
Comfortably, for most. At 150 x 200cm you each get 75cm of width, noticeably more than a UK double offers, and the independent pocket springs reduce how much movement carries across the bed. If one of you is broad shouldered or you regularly share with children or pets, the UK super king adds another 30cm of width.
Can I get the Canterbury 4450 UK king upstairs on my own?
Plan for two people. This mattress is delivered flat rather than rolled, and a 150 x 200cm, 27cm deep pocket sprung mattress with natural fillings is heavy and awkward on a staircase. Measure any tight landings and door frames before ordering, because there is no compressed box to squeeze around corners.
What room size does the Canterbury 4450 in a UK king need?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m feeling genuinely comfortable. That allows walking space on both sides and room for bedside tables. New build master bedrooms can be tighter than they first appear once wardrobes go in, so measure the usable floor rather than the room on the plan.
Is a UK king long enough for someone over six foot?
At 200cm, yes for most people. That is 10cm longer than a UK double, which is often the difference between feet hanging off the end and a proper night's sleep. If you are well over six foot and want more width too, the UK super king keeps the same 200cm length.
Where can I buy the Canterbury 4450 in a UK king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so what you see reflects current availability for this size rather than a snapshot. Availability can differ between sizes of the same mattress, so a deal on the UK double will not always apply to the UK king.