Harrison Spinks Ultra Plush 4500 Medium Mattress

Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.

A medium feel tends to suit most sleepers, particularly those who move between back and side sleeping through the night, although anyone who prefers a firm, supportive surface may want to look elsewhere in the Harrison Spinks range. Pocket springs also help with motion isolation, which means you'll feel less of a partner's tossing and turning. If you buy from Mattressman, the listing includes free next day delivery and a 60-night trial, though those are that retailer's own terms rather than a Harrison Spinks offer, so they won't necessarily apply wherever you shop. It sits at a mid-range price point for a pocket spring mattress from an established British maker.

Combination sleepers
A medium feel suits people who shift between back and side sleeping through the night, so one surface works in more than one position.

Back sleepers
The medium firmness sits in the middle of the range, which should give back sleepers a balanced feel that is neither too hard nor too soft.

Side sleepers
A medium feel is a sensible match for side sleeping, and the copy singles it out for people who regularly roll onto their side.

Couples
Pocket springs help with motion isolation, which means you'll feel less of a partner's tossing and turning, and Double, King and Super King sizes are available.

If you sleep hot and want confirmed cooling features, or you need a firm surface for a heavier build, this may not be the one. With no published detail on fillings, depth or spring count, cautious buyers who like to compare specs line by line may find the lack of information frustrating.

How firm is the harrison spinks ultra plush 4500?

It's listed as medium. That's the middle ground of the firmness scale, which means a balance of cushioning and support that suits most back and side sleepers, though lighter sleepers may find it slightly firmer than expected and heavier sleepers slightly softer.

What sizes does the ultra plush 4500 come in?

Four sizes are listed: UK Double, UK King, UK Super King and EU Single.

Does the harrison spinks ultra plush 4500 come with a trial?

Mattressman lists a 60-night trial on this mattress. That's the retailer's own offer rather than a manufacturer guarantee, so if you buy from a different shop the trial terms may differ. Check before ordering.

How quickly can the ultra plush 4500 be delivered?

Mattressman offers free next day delivery on this model, with a handling time of 0 to 1 day and transit of 1 to 3 days. These are that retailer's terms, so delivery from other sellers may vary.

What type of mattress is the ultra plush 4500?

It's a pocket spring mattress. Each spring sits in its own fabric pocket and moves independently, which means better contouring to your body and less motion transfer from a partner than a traditional open coil design.