Harrison Spinks Grassington 5750 Pocket Mattress
Mattress
Harrison Spinks Grassington 5750 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
28
Layers
2
Layer Details
- Comfort Layer. 100% natural Yorkshire wool blended with cotton, flax and hemp fibres. These wick away moisture and regulate temperature, which means less overheating than you'd get from synthetic fillings.
- Support System. 5,750 pocket springs, a mix of traditional pocket springs and mini springs, each encased in breathable cloth pockets using Harrison Spinks' Cortec Quad Core spring system. Each spring moves independently, so you feel support where your body needs it rather than a uniform push back.
Layer details from mattressonline.co.uk product page, September 2026.
- Fits the rooms most of us actually have: At 4ft 6in x 6ft 3in, the UK double leaves space for a wardrobe and drawers where a UK king would crowd them out.
- Room for bedside tables on both sides: Allow at least 2.6m x 2.8m and most couples can still keep a table and lamp each, which a bigger bed often rules out.
- Precise support for two different bodies: The Cortec Quad Core springs move independently, so a lighter and heavier partner each get support in their own zone rather than rolling together.
- Cool sharing, even at close quarters: Two people at 67.5cm each generate heat, but the wool, cotton, flax and hemp fillings wick moisture, so the bed stays drier than foam would.
- Easy to dress and replace bedding for: Standard double sheets and a 200 x 200cm duvet are stocked everywhere, at every price point, which softens the cost of an expensive mattress.
This size suits you if...
You share the bed every night and your bedroom is a typical UK size, where a UK king would dominate the floor. It also suits a solo sleeper who likes to spread out, or shares with a cat or dog that claims a corner, and a guest room that hosts visiting couples will get years of use from it.
Consider another size if...
You and your partner both sleep warm or move around at night, because 67.5cm each is snug. The UK king adds 15cm of width and 10cm of length; if your room allows at least 2.7m x 2.9m, we'd recommend the UK king instead.
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Is the Grassington 5750 in a UK double big enough for a couple?
For most couples, yes. You each get 67.5cm of width, which is the long standing UK standard for sharing, and the independent pocket springs reduce the disturbance you feel when your partner turns over. If either of you is broad shouldered or restless, the UK double may feel tight, and sizing up is the fix.
What room size do I need for the Grassington 5750 UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. The mattress itself is 135 x 190cm, so in an average room you should still fit bedside tables on both sides plus a wardrobe. Measure with drawers open and doors swung before you order.
Will the UK double Grassington 5750 get up narrow stairs?
It's a pocket spring mattress with natural fillings, so it doesn't arrive vacuum rolled and it's heavy. At 135 x 190cm and 28cm deep, it will flex a little but won't fold, so check the turn on older terraced staircases and tight new build landings, and have two people on hand.
Should I buy the Grassington 5750 in a UK double or size up to the UK king?
Choose the UK double if floor space is the constraint: the UK king is 15cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m of room for it. If you have that space and share every night, the UK king is the more comfortable long term buy of the two.
Where can I compare prices for the Grassington 5750 UK double?
Prices for natural pocket sprung mattresses like this vary by size and change often, so compare the retailers listed on this page. The prices shown here are updated as retailers change them, which matters at this end of the market where a sale can make a real difference.