They might offer you medication automatically. It's up to you whether you take it or not.
I take metformin because it helps with weight loss (supposedly!) and gives some sort of protection against heart disease and stroke and possibly (new research) some cancers. Make sure they ease you on to it - 1 first week, 2 next, etc - and if you have bad gastric problems, ask for the SR (slow release) version.
I won't take statins -my personal choice, I suggest you read up on them and make your own mind up, particularly if your cholesterol is reasonably good. Low carb will improve it anyway.
BP - if you have raised blood pressure, why not take the meds. Again, low-carb will help as well. If your BP is fine and they still offer you meds, ask why and think carefully. I think some of them protect our kidneys, but if you don't have kidney problems, or high BP - why take them? I've recently come off them as my weight and BG have come down.
If you decide to accept any/all of the meds, make sure you read the leaflets carefully, and if you have time, Google for side-effects and interactions. Or ask your local pharmacist - they know more than the GPs and are usually only to happy to answer questions.
Good luck!
Viv 8)