But to get to my questions,
1) how long before Metformin is effective, my blood sugar level is all over the place when following the test guidance in Diabetes UK book (which is very good) before / after meals :?
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In answer to your first question, look at this link it should answer all your questions about Metformin. If you still need answers ask.
http://www.healthyontario.com/Assets/Pd ... Advice.pdf
2) Is Metformin available as a free prescription? (I pay for my medication) I have read that Drugs for the treatment of diabetes can be issued a prescription exemption certificate by completing form FP92A from your doctor's surgery. :?[
As a Diabetic on medication ALL your prescriptions will in future be free. You are right in saying that you need a Prescription ExemptionCertificate by getting the form signed by your GP and sent off. That's all there is too it.