He or you ? Why would you pay ?
I dunno go read the inter web and see what they charge import tax on if its 40 quid value im sure it wont be more than 10 quid max.
Declare it on the customs label as something with no value, like UKIP manifesto's or Used Manga DVDs
The limit is KRW 150,000 which is around 80GBP. Make sure you give details of the goods and the price.