Desworthy Editorial Team
Desworthy editorial reviewer focused on ergonomic chair research, desk tech, affiliate disclosure, and practical UK home office buying decisions.
Last reviewed on by Desworthy Editorial Team.
Choose the model, then check the current offer
Use the fit guide, budget shortlist, and Sihoo comparison together. When you know the right lane, move to the live chair deal feed.
Source information was checked on 7 October 2026. The editorial update date above does not mean prices, availability or retailer terms were checked again. Confirm those details with the retailer before buying.
Start with IKEA MARKUS or Sihoo M18 if you want a padded seat around £160. Choose M57 if mesh under your thighs and manual lumbar positioning matter. Around £250, B300 Pro, C300 and S100 supply different control layouts, so decide which problem you need the chair to solve before comparing a sale badge.
Last verified: 7 October 2026. The six selected listings below were under £300 before delivery and separately applied codes. Colour and footrest packages can move a model outside this budget.
Six starting points, with a reason to pay for each
| Selected UK chair | Listing price | Seat/support decision | Check before ordering | Original source |
|---|---|---|---|---|
| IKEA MARKUS, Vissle Light Grey 505.218.61 | £159 | Padded seat, mesh back and a ten-year published guarantee | Fixed 47 cm seat depth, 46–57 cm seat height and useful arm position | IKEA UK |
| Sihoo M18, White | £159.99 | Padded seat with manually positioned lumbar support | Obtain the seat measurements your fit decision needs | M18 UK |
| Sihoo M57, Light Grey | £199.99 | Mesh seat/back, manual lumbar controls and 3D arms | Check thigh clearance and usable pad positions | M57 UK |
| Sihoo B300 Pro, White Standard | £239.99 | Dynamic MicroFit lumbar support and a published 42–47 cm seat slide | Check the 48.5 cm width and stated 120 kg load limit | B300 Pro UK |
| Sihoo Doro C300, Black Standard | £249.99 | Adaptive lumbar support and coordinated 4D arms | Confirm the exact seat-depth control if essential | C300 UK |
| Sihoo Doro S100, Black | £259.99 | Dual dynamic lumbar sections, mesh and 4D arms | Obtain the complete usable seat range before relying on a fit claim | S100 UK |
If you want padding, start around £160
MARKUS and M18 are only 99p apart at these selected listings. The decision is about fit and controls, not a meaningful price saving. MARKUS has a clear current dimension table and the longer published guarantee. M18 provides manual lumbar height/depth adjustment and height-adjustable arms.
Try MARKUS in store if possible, using a normal typing posture rather than just leaning back. Its 47 cm seat depth can be the deciding measurement when the seat reaches too far under your thighs. For M18, obtain the exact measurements you need rather than substituting overall chair dimensions for seat dimensions.
The M18 versus M57 guide explains the next price step if you prefer mesh. M57 versus MARKUS compares the two different seat and lumbar arrangements directly.
Around £250, identify the control you are buying
For an explicit 42–47 cm seat slide, compare B300 Pro first. C300 offers a different adaptive support layout and a slightly wider published seat. For dual moving lumbar sections in a mesh chair, S100 belongs on the shortlist.
These are buying routes, not a ranking of comfort. The B300 Pro versus C300 comparison compares the published depth, width and load figures. The C300 versus M57 comparison shows another useful price detail: M57 Black at £229.99 was just £20 below C300 Black Standard.
A mesh seat does not establish a measured cooling advantage in the cited sources. An adaptive lumbar section does not establish less back pain. Use the HSE workstation checklist to check the seat, feet, backrest and working reach as one setup.
The budget includes the cost of changing your mind
A chair under £300 can still be an expensive mismatch. Confirm the seller, selected version, delivery charge, assembly conditions and return transport before paying.
Sihoo’s main return policy describes a 30-day route with condition and packaging requirements. Its after-sales policy assigns non-defect return shipping to the buyer. IKEA’s extended return policy has different conditions and refund routes for unopened versus opened or assembled goods. Do not treat the headline number of days as the whole policy.
Frequently asked buying questions
Which chair is the lowest priced here?
The selected MARKUS was £159 and M18 White £159.99. A 99p gap should not override a seat or support preference. Check delivery and the exact configuration before choosing the payable price.
Is every C300 below £300?
No. Black Standard was £249.99, while Black Footrest was £349.99 when checked. This guide’s C300 row refers to the standard chair.
Which option has the clearest seat-slide claim around £250?
B300 Pro explicitly describes 5 cm adjustment and supplies 42–47 cm endpoints. The standard C300’s exact UK control should be confirmed before relying on its listed range.
Should I spend the entire £300 budget?
Only if the extra control or construction solves a specific problem. If the less expensive chair fits and supplies the controls you use, a footrest or another workstation adjustment may be more useful than the next chair tier.
Where are the current Sihoo offers?
The Sihoo UK hub links the selected offer pages. For a broader model comparison, read the current Sihoo lineup guide. Check accepted codes and the final basket separately from this dated price table.
References and price scope
Sources were checked on 7 October 2026. The table links the exact original UK product pages. Prices exclude delivery, return costs and unconfirmed additional codes. Desworthy’s 99p and £20 differences are calculations from the named listing prices; no comfort ranking or laboratory score is implied.
Image credit: Sihoo, product photograph.
Note: This article is for reference only.