I think www.printing.com offer a pretty good service, I used them last year. (and I have no connection with them.)
It's good for people without design skills or software, as you choose from a range of pre-designed templates and add your own details. It's a big choice and I managed to get something quite classy-looking that I have been really pleased with.
The card and printing quality is pretty good and I think it cost about 50 quid for 500 cards. You can have the cards sent or pick them up from many places in London (who act as the actual printers - with the website offering the interface - it's quite clever.)
They do stationery as well, but I have not used this service so I can't vouch for it.
Traditionally, intaglio printing was the specialised process (employing engraved rotary printing surfaces of steel) used to print currency, bonds, stock certificates, and high-quality business stationery. Ink is transferred from engraved recesses on the printing surface directly to sheets of paper transported through the press. Intaglio printing excels at reproducing artwork that consists of fine lines and small solid areas. It cannot be used to reproduce photographic images or to print large unbroken solids.
The use of passed ink and deeply recessed printing surfaces gives intaglio printing a distinctive raised texture. It was widely adopted by those wishing to mark themselves out as "professionals".
The use of engraving for commerical stationery has fallen away with the move from typewriters to networked PCs as most laser printers will tend to "squash" the raised texture! The business card envy scene in American Psycho has also reduced the status in the city.
Powdered resins can be heat-fused to freshly printed wet lithographic or letterpress inks to simulate this effect at far less expense, which is why most so-called "engraved" business cards and stationery currently on offer are produced in this manner.
IMHO these are exceedingly naff.