[quote][color=#000000][font=Arial, Verdana, Helvetica, Geneva, SunSans-Regular, sans-serif][size=3]If you order or send purchased goods other than alcohol, tobacco, perfume and toilet water from a country outside the EU then you:[/size][/font][/color][list]
[*]don't have to pay Excise Duty
[*]may have to pay Customs Duty on goods with a value that exceeds £135
[*]will have to pay import VAT on goods with a value that exceeds £15
[/list]
[/quote]
So you owe HRMC some money.
EDIT
Actually just saw this
[quote][color=#000000][font=Arial, Verdana, Helvetica, Geneva, SunSans-Regular, sans-serif][size=3]Note that on all goods from outside the EU, Customs Duty is waived if the [/size][/font][/color][b]amount of duty[/b][color=#000000][font=Arial, Verdana, Helvetica, Geneva, SunSans-Regular, sans-serif][size=3] calculated is £9 or under.[/size][/font][/color][/quote]
So just buying your strings one set at a time you save 20%