Agree totally - services make up a large proportion of our exports (as does gold transactions - even though it never leaves the bank of England)
I have a friend who works for a bank - they have taken precautions on passporting already - which mean some jobs going overseas.
Even though the bulk of the work will remain here.
Still lots of scenarios to play out
Have a read here though - one of many backdoors that will open up
http://www.wired.co.uk/article/estonia-e-resident
You can become a resident of Estonia (done electronically) and start your own business in the EU, or run your existing UK business through Estonia , you then become an EU business.