White coat hypertension is well recognised.
Would be worthwhile to get a 24 hour ambulatory measurement. Shame your surgery can only do that by a referral to the cardiology clinic.
With a BP of 160/90 I suspect that the 24 hour measurement will be just fine (mind you that is suspect I can't give a guarantee!)
You may want to have a look around and see if there are any surgeries around which would be able to do it for your sooner than the cardio clinic.
HTH
FD