for charges when importing to the UK, contact customs and excise and obtain a commodity code for the product, this code is correlated with the amount of duty you will pay, ask C&E and they will tell you... some products such as handheld game controllers etc are duty free...
Also, you will pay VAT i.e. 17.5% - this is charged at 17.5% of Cost + Insurance + Freight.. yes we are taxed on shipping also, the benefits of living in 'rip off britain'!
yes, you can ask your supplier to label the package as 'gift' or 'samples' to avoid VAT..... lol theoretically speaking as I would never do a thing like that and don't condone it :-)
hope this helps.