Hi
If you are based overseas and supplying consultancy services then the reverse charge should be used by your UK business customer to account for the VAT. You can see the guidance here:
Reverse charge
It is not the case that all NETP's are required to be registered for VAT. They would only be required to register for VAT if they are making taxable supplies in the UK which would not be subject to the reverse charge by the UK business customer.
Thank you.