Harrison Spinks Canterbury 4450 Small 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
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress. These is where it costs 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
- Real space for one: At 30cm wider than the UK single, you can shift position through the night without meeting the edge, which combination sleepers will notice.
- Fits compact rooms: It's 15cm narrower than the UK double, often the difference between a room that works and one where the door catches the bed.
- Full spring count in a smaller footprint: The 4450 pocket springs and micro posture springs contour to your shape across the whole 120cm width, so a solo sleeper gets support wherever they settle.
- Natural fillings that breathe: British wool, flax and cotton wick moisture away, useful in smaller rooms like lofts and box rooms where air can sit still.
- Standard 4ft sizing: The small double is a standard UK size, so frames, fitted sheets and a regular double duvet are all easy to find.
This size suits you if...
You sleep alone and have outgrown a single but your room can't spare the width a full double demands, you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly, or you're kitting out a loft conversion or box room where every centimetre of floor space matters.
Consider another size if...
You share the bed every night and want it to stay comfortable long term. A 120cm width is tight for two on a nightly basis, so we'd recommend the UK double instead, allowing at least 2.6m x 2.8m of room.
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 a small double big enough for the Canterbury 4450 to suit a couple?
For occasional nights, yes. Two adults can share the 120cm width, and the independent pocket springs limit how much you feel a partner moving. For every night, most couples find it a squeeze, and the UK double gives you 15cm more width. As a guest room mattress for visiting couples, the small double is a sensible choice.
Will the Canterbury 4450 small double fit in a box room?
Usually, yes, that's largely what the size is for. The mattress is 120 x 190cm and we suggest a room of at least 2.4m x 2.8m so you can still open drawers and walk round the foot of the bed. Measure with the door swing in mind, since the 15cm saved over a UK double is often what keeps it clear.
Can I get the Canterbury 4450 small double up a narrow staircase?
This mattress arrives flat rather than rolled, all 27cm deep of it, so you can't unbox it in the room. The upside of the small double is that a 120cm-wide flat mattress turns tighter corners than a 135cm or 150cm one, but measure your stairwell and landing before ordering, and plan for two people to carry it.
What bed frame do I need for a 4ft small double mattress?
A standard UK small double frame, sometimes labelled 4ft or 120cm. It's a recognised UK size, so frames and divans are widely available, though the range is slimmer than for a double. Given the Canterbury 4450's flat, traditional construction, a sprung slatted or divan base will let its pocket springs do their job properly.
Is a small double worth it over a single for one adult?
If the room allows, usually yes. The extra 30cm of width means you can stretch, roll and change position freely, and the Canterbury 4450's micro posture springs adjust to your shape wherever you lie rather than in one worn channel. The lengths are identical, so you only need the width, not a longer room.