Office equipment including office machinery and furniture; paper, envelopes and other office stationery; business cards and other personal and business printing
Office equipment & consumables including laminators, binders, print finishing and ink cartridges. UK delivery free over £75, otherwise from £3.95
Stationery and other office supplies including furniture. Lowest price guarantee. Free delivery on orders over £30, otherwise £3.95. 20% off first order. 
Organisers, diaries and fillers, direct from the manufacturer. UK delivery from 95p depending on order value.
Traditional office furniture and a fair selection of reproduction antique desks, chairs and cabinets. Delivery usually in 3 days.
Select stationery and other office products, computer consumables, hygiene supplies, office furniture, catering etc. from several suppliers. Not the quickest. 
Office Supplies, furniture, print and computer consumables. Worth looking at for price. Free UK next day delivery on orders over £50 (before VAT) otherwise £3.95
Stationery and office furniture and equipment including computer hardware and accessories, but not computers. UK mainland next day delivery free over £40, otherwise £9.99
100 free business cards when you try their printing service. £3.99 postage. Free logo / photo uploads (Vistaprint usually charge) but only 100 free cards (250 from Vistaprint).
Stationery, office machines, office essentials, computer bits, catering and furniture. On most products, free mainland UK delivery over £35, otherwise £5.28
All the stationery and office essentials you would expect, plus a bigger than average technology section. Free next day UK delivery over £30 ex VAT, otherwise £2.90
Office furniture, stationery and other supplies including technology, health & safety, catering etc. Next working day delivery free over £40 (ex VAT), otherwise £5.95
Mostly modern office furniture: desks, office chairs, tables and storage etc. . Free UK delivery over £395. 
Part of Office Depot. Stationery and consumables, furniture and office equipment. Free delivery over £30 ex VAT (£35 inc VAT)
250 free business cards (you pay postage and VAT). Wide selection of printed items which can all be designed online, incorporating your own logo or picture if required.
Famous for stationery and books but also DVDs, CDs and magazines. Have your order delivered to a store for free or home, free over £25, otherwise £3Related pages
Some offers
priced in single reams.
Less for quantities
20% off first order
Excl VAT
£27.36
From envelopes to print finishing machines, if you want something for the office, you should find it here.
One of the best known suppliers of everything for the office is Viking. With free and very rapid delivery, even on relatively small orders, they are hard to beat. They are global players in the office supplies market, being part of Office Depot, so their buying power results in keen pricing for stationery and other office standards. There are also good deals on a small range of furniture, but you still need to compare carefully if you are looking for something a little less ordinary. Delivery is free on orders over £30 (before VAT).
Office Giant are not as big as Viking but they have a very similar range and some competitive prices, so it is worth taking a look. They deliver free to the UK on orders over £35 and delivery is usually next day if you order before 5pm. Some larger things, such as furniture and electrical items, may take a little longer. Delivery on smaller orders is £2.95. In the same vein, Euroffice guarantee the lowest price, with a price-match if you know different. They also have a loyalty scheme that earns points which make prizes and free delivery on orders over £30 or £3.95 below that. Euroffice usually have a discount code, so it is worth checking the discount code page. The extra discount can be very high, typically 20% if it is your first order with them.
Staples is the world's largest office products company with outlets in 21 countries throughout the Americas and Asia as well as Europe. They have stationery, office equipment and furniture and also a fair selection of laptops and computer accessories. They deliver next day if you order by 5pm and free if your order is worth £30, otherwise there is a £2.90 charge. Ryman sell similar products and deliver most things free to the UK mainland on orders over £35. Below this there is a charge of £5.28 and there is also a flat rate charge of £10 on some items.
Butonz supply a narrower range of office equipment and specialise in everything to do with laminating, binding and print finishing. Delivery to the UK mainland is very expensive on tiny orders, but reduces to £3.95 if you are spending over £35 and is free on orders over £75 (all before VAT).
Other specialists are Furniture at Work who supply office, meeting room and board room furniture in modern styles and in reproduction antique styles, all at a discount. They also have a 48 hour office planning service. You can collect from London, Glasgow or Liverpool or for 10% of the order value (minimum £2.80) they will deliver. Most furniture is available within 5 - 10 days, but some office essentials such as chairs can be delivered in 1 - 3 days where necessary.
Vistaprint and Ooprint will print office stationery, such as business cards, posters, flyers, brochures and so on. You can design what you want online, starting from scratch or using their design templates and you can incorporate your own logo or other illustration. Vistaprint usually charge for the first use of your own logo or photo although they do have occasional half price and free upload offers. Ooprint uploads are always free. It is worth going for the free business cards offered by both companies (which are not quite free, because you pay for delivery) but for under £4 you get business cards and a chance to see the quality. If you like what you get, you can order other things. Have a look at the sites and try out their freebies. Even when you add the oncosts (delivery, VAT and even fuel surcharge!) they are still worth trying, especially for short runs.