Pretty interesting article on massive discrepancies in trade statistics for services, where the UK is either vastly underestimating the value of service imports or other countries are overestimating the value of the services they export to the UK:

https://www.ft.com/content/9f1d7ad2-...1-e5de165fa619

Still waiting to hear from experts but given that other many other countries have more robust reporting/data collection strategies, I think it's more likely that the UK has been underestimating its services imports.