How many of those services are cross-border though? Does "services" include real estate agents and IT contractors?

One example of things the UK have been exporting is audits, to large companies in the EU. UK auditors are no longer accredited to perform audits of EU countries. Now the have to retake an exam, and then work for 3 years as a apprentice of someone who is already accredited. Since there is no one in the UK that is accredited you pretty much have to move to the EU for 3 years to do that. You can imagine that for a lot of people with families that are 40+, that pretty much ends their careers. Apparently the same goes for many other finance and legal professions.

The majority of UK exports is also services.