The clinician who requests the tests will normally tell you the timeframe it will take for your results to be returned to the practice.
For results from a recent test:
Smear test results will be sent directly to you from the screening program.
Information on most common test types
Blood Tests: www.nhs.uk/tests-and-treatments/blood-tests/
X-Rays: www.nhs.uk/tests-and-treatments/x-ray