Hello, I'm Keith and happy to help you with your question.
The Channel Islands (CI) are not part of the EU, nor do the States of Jersey or Guernsey have VAT thus companies registered in the CI would not have VAT on their invoices for goods and services. As far as UK traders are concerned goods exported to the CI ate zero rated supplies. Services a trifle more complicated, see below:
'VAT on services UK VAT may need to be charged on services performed in the Islands or to clients based in the Islands, depending on the nature of the service supplied. This is a complex area, but broadly, assuming the supplier belongs in the UK and the customer belongs in Jersey, UK VAT will need to be charged on most services unless one of the following exceptions applies:
UK VAT does not need to be charged on most services relating to land or property situated in Jersey. This includes estate agency, conveyancing, architects, surveying, construction, property maintenance, hotel accommodation, defined exhibition stands, and property management services.
UK VAT does not need to be charged on most services related to a live event or physical activity carried out in Jersey. This includes cultural, artistic, sporting, scientific, educational, training, entertainment, exhibition and valuation services.
UK VAT does not need to be charged on passenger transport carried out in Jersey.
UK VAT does not need to be charged on most ‘intellectual’ or ‘intangible’ services supplied to a customer who belongs in Jersey. This includes copyright, royalties, licences, advertising, consultants, engineers, lawyers, accountants, banking and insurance. If the service relates to land or property situated in the UK VAT still needs to be charged.
There are special rules for hired goods (section 13 of VAT Notice 741) and telecommunications (section 14 of VAT Notice 741). With all these services, it is important to look at the precise nature of the underlying service being provided. A business cannot turn one type of service into another simply by changing the description on the invoice.'
Regarding online classified website businesses they must apply VAT applicable to the State in which they are registered. A classic example ie eBay.co.uk, operating from Luxembourg, who charge Luxembourg VAT (15%) on all invoices etc.
I do hope that helps throw some light on your question.