Hi LB T,
From the information provided it appears that you do not make any taxable supplies in the UK only abroad.
However, if you have a business establishment on the UK or you live in the UK, you may be able to register for VAT on a voluntary basis subject
to the requirements in section 2.9 of notice 700/1
Who should register for VAT (VAT Notice 700/1) 2.9 If you only supply goods or services abroad
You would need to be VAT registered in the UK in order to reclaim any UK VAT that you are incurring in relation to your supplies.
Thank you.