VAT is a tax added to items sold in the UK. Called Value Added Tax. Standard rate is 20% so a simplistic explantion is that here an item advertised for sale as £100 plus VAT would mean you pay £120 & the business selling it keeps £100 & pays £20 to the taxman.
As you are outside the EU any purchases by you from the UK would be VAT exempt.
Don't take any notice of it in spartacus' post as that's just his tagline, same as Chris Going's details in his posts & these will appear in all their posts & isn't part of the answer. You'll see there's a solid line between that & the actual post.