A second hand boat is considered new if:
A vessel or aircraft is not new
when more than three months have elapsed since the date of its first entry into service (see paragraph 2.3), and
it has, since its first entry into service, travelled under its own power for more than
100 hours if it is a boat, or
40 hours if it is an aircraft.
More infos here:
http://customs.hmrc.gov.uk/channelsP...yType=document
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