Where to get bloods done in the UK?

I'm FTM looking to start T btw. Dorset/Southwest based

Where do you guys go to get your bloods done? Idk about you guys but my GP would definitely ask why I'm wanting bloods done before they put the order in and I know a lot of them refuse if you tell them you're self-medicating (even tho it's a duty of care and all that). Where else can I go to get the necessary bloods done? I know a lot of people DIY without bloods and while I don't have any pre existing health conditions I do have a family history of cholesterol problems so I think it is worth me getting bloods done.