The duty costs are available on the HMC&E website. You will pay import duty and VAT.
It depends on who posts them and who delivers them. All of the major couriers will either pay your duty and invoice you afterwards, or ask for it before delivering. Very few suppliers will mark the package as a 'gift' or 'sample' in an attempt to avoid duty.
The major ebay sellers say that you will not be hit for duty or VAT, as the goods are delivered from a UK address.
When I looked at few cordless power tools from the US, by the time you have paid all the taxes and delivery costs and replaced the chargers etc to UK voltage, then costs were higher than a cheap UK supplier
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