Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
22
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
5
Price Range
£636 to £1,368
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress suits you if natural materials matter. There is no memory foam here, just wool, cotton, hemp, flax and viscose over pocket springs, which means better breathability, a real plus if you're a hot sleeper. The springs are 100% glue free and include Advanced Cortec pocket springs, and the whole thing is handcrafted in the UK by a National Bed Federation approved brand. The medium feel should suit most sleepers, although those wanting a firmer, more supportive surface may find it a touch soft. Yes, the price climbs steeply in larger sizes, but you're paying for traceable British wool and a genuinely natural build, and the £636 starting price is reasonable for this kind of construction.
Key Features & what's inside
- Cover. A soft blend of wool and viscose that is fire resistant and chemical free. That means no chemical fire retardant treatments against your skin.
- Comfort layer. Traceable British wool forms the soft cushioning layer. Wool naturally regulates temperature, which means less overheating on warm nights.
- Interior blend. A blend of cotton, hemp and flax sits within the interior. These natural fibres add breathable padding between you and the springs.
- Support system. 2500 high density pocket springs, each 100% glue free and encased in its own fabric pocket, including award winning Advanced Cortec pocket springs. Individual pockets mean each spring moves independently, so you feel less of your partner's movement.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you want a distinctly firm mattress, this medium feel may not give you enough push-back, particularly if you're a heavier back sleeper. Equally, if you love the slow, cradling sink of memory foam, an all-natural spring mattress like this will feel springier and more traditional than you might expect.
Harrison Spinks Collingham 3250 Pocket Mattress
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Is the Harrison Spinks Collingham 3250 firm or medium?
The retailer's product page describes it as medium, although some other listings label it medium firm. In practice, expect a balanced feel that suits most sleeping positions, though lightweight side sleepers should find enough give from the wool comfort layer.
How many springs does the Collingham 3250 have?
The listing states 2500 high density pocket springs, each glue free and encased in its own fabric pocket, including Advanced Cortec pocket springs. Slightly confusingly, that figure differs from the 3250 in the model name, so go by the stated spring count.
Does the Collingham 3250 come with a trial period?
Mattress Online lists a 100-night trial, but this is the retailer's own offer rather than a Harrison Spinks policy, and it requires buying a mattress protector from them. If you purchase elsewhere, check that retailer's returns terms before you commit.
What is the Collingham 3250 made of?
Natural materials throughout: a wool and viscose cover, traceable British wool cushioning, and an interior blend of cotton, hemp and flax over pocket springs. There is no foam, which means a more breathable, traditional feel. It is fire resistant to BS7177: 2008 without chemical treatments in the cover.
How is the Collingham 3250 delivered?
Mattress Online offers free delivery to most locations with a two-hour time slot, including next day on weekdays, a weekday of your choice up to 60 days ahead, or weekend delivery. Standard delivery is to your front door; room of choice costs £20.00 and old mattress recycling £35.00.
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