OK having got there: they will try various pills. From experience these will not work on the first pass. (or the second) I had one set of pills for one month, then a second set for the next month and finaly a 3rd set for the 3rd month, and these finally reduced my bp to acceptable levels ( still good after about 5 years). I was off for 3 months, but got my class 1 back. I think that the waiting time could be reduced but the docs are running on old pills!!
Anyway keep the faith - it will sort itself out after some time.
There does not seem to be any follow up to see if the dose is correct - if it works under the NHS it stays. I am sure that the doses that I take could be reduced!!