I just bought mine in headphoniaks and they deliver internationally too:
Being the item located in Spain and having to ship to UK, it might take only 2-3 days and if the IEM breaks, it will always be easier and cheaper to send it back to Spain rather than Singapore. I think headphoniaks offers 2 years warranty in EU, whereas MP4nation only 1. It's really up to you.
Personally, I got the VSD1S after reading some comparaisons between the vsd1 and vsd1s and I'm frankly impressed!
How much is the shipping costs for EU destinations? I can only see that it's 4 euros for Spain.