Client VAT registered in the UK flies out to Saudi Arabia to perform service and flies back to the UK when done. This happens every month. Should he be charging VAT on the invoices??
If you provide services to customers outside the EU, you usually do not charge VAT. However, if the service is used in another EU country, that country can decide to charge the VAT. You may still deduct the VAT that you paid on related expenses, such as for goods or services purchased specifically to make those sales.