What if my blood pressure is too high at my DVLA medical?

Thanks for this as I said in my other post I get white coat syndrome pretty bad so I’ve been put on Propanolol 10mg.
I guess my best bet would be to go to the local pharmacy or dr’s and get 3? (hopefully) decent readings to take with me before doing my d4 medical just to cover me if I’m too high on the day?