Blood Test - Private. Who to go with?

Hi, I'm looking to take a private blood test as I haven't had one taken for a very long time and would like to get back to taking supplements and just generally look after myself more. Last time I took a blood test was with the NHS and they don't check everything. I'd like a blood test that checks basically most of the usual health markers that you would typically check and plus testosterone. What company do you guys recommend? What do you think is beneficial for the average person to check on a blood test? Bear in mind, i'm generally quite healthy.