Harrison Spinks Canterbury 4450 Double 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
£1,149
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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
- The classic shared size: At 135cm wide you get 67.5cm each for two people sharing, enough for most couples who sleep reasonably close.
- Fits rooms a king would crowd: We suggest at least 2.6m x 2.8m for a UK double, which means space left over for bedside tables on both sides in a typical British bedroom.
- Natural fillings, sensible width: The wool, flax and cotton fillings breathe well, so two bodies sharing 135cm won't turn the bed into a heat trap.
- Springs that work per person: The 4450 pocket springs move independently, which means a partner turning over on their side of the double disturbs you less than a connected spring system would.
- Easy to dress: Standard double sheets and a 200 x 200cm duvet fit, stocked everywhere at every price point.
This size suits you if...
You share the bed with a partner in a typical UK bedroom and want space for both of you without the bed dominating the room, or you sleep alone and like to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that regularly hosts visiting couples, where a comfortable traditional mattress makes staying over feel less like camping.
Consider another size if...
You and your partner both like real space, or one of you sleeps restlessly. The UK king is 15cm wider and 10cm longer, and we'd recommend it if your room measures at least 2.7m x 2.9m.
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FAQ's
Is the Canterbury 4450 double big enough for two adults?
For most couples, yes. The UK double gives 67.5cm each for two people sharing, and the 4450 pocket springs respond to each sleeper separately, so you're supported at your own weight rather than rolling together. Broad-shouldered couples or restless sleepers may prefer the UK king, which is 15cm wider and 10cm longer.
What room size do I need for the Canterbury 4450 in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows walking space on both sides plus room for bedside tables. If your bedroom is on the small side, measure before you order: the mattress itself is 135 x 190cm, and the bed frame adds a little more.
Is the double Canterbury 4450 hard to get upstairs?
It can be. This mattress arrives flat rather than rolled, so you're manoeuvring the full 135 x 190cm through your hallway and up the stairs. Tight turns in older terraces and narrow new build landings are the usual sticking points. Measure your stairwell and any awkward corners first, and plan for two people carrying it.
Should I get the Canterbury 4450 in a double or a king?
The UK double suits couples in typical bedrooms: it fits comfortably where the UK king would dominate. The UK king is 15cm wider and 10cm shorter... rather, 10cm longer, so taller sleepers gain legroom too, but it needs a room of at least 2.7m x 2.9m. If your space allows and you value stretch-out room, size up.
What bedding fits the Canterbury 4450 double?
Standard UK double sheets and a 200 x 200cm double duvet. Because the double is Britain's most common size, bedding is stocked everywhere at every price, which makes it cheaper to dress than the UK king or UK super king. Choose breathable cotton or linen bedding to let the mattress's wool and flax fillings do their temperature work.