Rest Assured Adleborough 1400 Pocket Ortho Mattress
The Rest Assured Adleborough 1400 is a pocket spring mattress with an extra firm feel, handcrafted in the UK.
- Genuinely extra-firm support
- Fibre top softens the surface
- Minimises partner disturbance
£395
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The Adleborough 1400 uses 1400 individual pocket springs that sit beneath a layer of soft white fibre fillings, which means you get firm, responsive support with a slightly softer surface to lie on. At 25.5cm deep, it's a reasonably substantial mattress, though the listing notes the dimensions table says 25cm with a tolerance of plus or minus 2cm. It suits sleepers who want a genuinely solid feel, although lightweight side sleepers may find it too firm for comfortable pressure relief. Sizes run from UK Single to UK Super King.
Mattress specifications
Firmness
Extra Firm
Type
Pocket Spring
Depth (cm)
26
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£395 to £725
Best Sleeping Position(s)
Stomach Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you want proper firmness rather than a mattress that merely calls itself firm, this one is accurately labelled: extra firm, with 1400 pocket springs each encased in cloth pockets, which means the springs respond to your body individually rather than moving as one unit. That helps with motion isolation if you share a bed. The soft white fibre comfort layer takes the edge off the firmness without undermining the support. It conforms to BS7177: 2008 for home use, Rest Assured is a National Bed Federation Approved Brand, and it's handcrafted in the UK. It's a fair amount of mattress for the money.
Key features & layer details
Comfort Layer
Soft white fibre fillings sit at the surface, which means the extra firm springs beneath don't feel harsh against your body. It's a cosy top rather than a plush one, so expect comfort without much sink.
Support System
1400 individual pocket springs, each encased in its own cloth pocket, adapt to your movement and distribute support to each part of your body. This gives firmer, more localised support than an open coil design, and less disturbance from a partner moving about.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Back sleepers
The extra firm feel and 1400 pocket springs give solid, responsive support, which suits anyone who likes to lie flat on a mattress that stays level.
Front sleepers
Extra firm springs with only a modest fibre top keep your hips from sinking in, which helps you stay level while lying on your front.
Couples
Each spring sits in its own cloth pocket, which means less disturbance when your partner moves about and a calmer night for both of you.
Heavier sleepers
Firmer, more localised support from 1400 individual pocket springs means a heavier frame is held up well, with little of the sink you get from softer designs.
Budget buyers
The copy calls it a fair amount of mattress for the money, with a 26cm build, handcrafted UK construction and a 5 year guarantee.
This is an extra firm mattress, so if you sleep on your side, are lightly built, or simply prefer a softer, more cushioned feel, it's unlikely to suit you. There's no memory foam or deep contouring here, just solid spring support with a modest fibre top.
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.
Rest Assured Adleborough 1400 Pocket Ortho Mattress
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FAQ's
How firm is the Rest Assured Adleborough 1400?
It's rated Extra Firm, and owner reviews describe it as firm to extra firm in practice. That makes it best for people who want substantial back support and a solid sleeping surface, rather than anyone hoping for a softer, more forgiving feel.
Does the Rest Assured Adleborough 1400 come with a trial?
Mattress Online offers a 100-night trial. That's the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere, check that seller's terms before ordering.
What guarantee does the Adleborough 1400 have?
The Mattress Online listing states a 5 year guarantee. As this appears on a retailer listing rather than the brand's own site, confirm the guarantee terms with your seller at the point of purchase.
How deep is the Adleborough 1400 mattress?
The listing describes it as 25.5cm deep, though its dimensions table gives 25cm with a stated tolerance of plus or minus 2cm. Either way, it's a mid-depth mattress that should work with standard fitted sheets.
What sizes does the Adleborough 1400 come in?
It's available in UK Single, UK Double, UK King and UK Super King.
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