I am very sceptical of paid for “health screening”, and many medics I have spoken to agree.
I would ask if there is a good credible scientific basis for the tests you are paying for. Are the risks/benefits adequately explained to you beforehand?
Some tests results may not be that meaningful, results may not necessarily negative or positive, and knowing about some conditions may not limit or improve your quality of life or longevity.
Just my thoughts, but I can understand why some want the reassurance of undergoing screening, particularly as the NHS can be difficult to access at present.
Many worthwhile screening tests can be accessed via GP practice, or national screening for cervical, breast and bowel cancers, which are evidence based.