I'm thinking of buying some ink and cartridges from Alibaba, of course this all comes from china, what are import duties likely to be ? I can make a huge saving on ink for my printer but do not want to get stung with customs duties that make it too costly, I've never been able to find this sort of information so wonder if anyone has had previous experience ?
Legally, the situation is that you'll be liable for VAT on any consignments with values over £18, and Customs duty on anything worth more than £120 (unless the amount of duty is less than £7!). VAT is obviously charged at the prevailing standard rate, whereas Customs duty can be all sorts of percentages based on the type of goods in question. So depending on what sort of sums you're talking about you may be able to neglect duty entirely and just look at the VAT.
http://www.hmrc.gov.uk/customs/post/buying.htm is a reasonable starting point for information, although I think you'll have to brave their helpline number to get a definitive answer (for instance, I can find "ink jet cartridge without print head" appears to be classification 3215 1100 00 in the Tarriff but not the actual rate of duty corresponding to that opaque identifier...)
... and of course, some foreign sellers are happy to mark things as gifts or having no value, even if you don't ask (e.g. a set of scope probes I bought from Hong Kong recently, although since they were £12 it made no difference). Not that defrauding the taxman is to be recommended, naturally!