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If the former, wonder where he got the pins and barrels.
https://www.medisupplies.co.uk/Syringes-Needles
Or, if you want to buy anonymously rather than online, nip down to John Bell & Croyden in Wigmore St and pay cash, I've bought needles from them before as they have 1001 uses around the home and workshop, regardless of any medical matters.
Thousand of people learn to inject themselves with drugs every year for various conditions or for nefarious purposes, it's not rocket sience
First thing I wondered was how he afforded it- but then I am assuming that doping is expensive, I suppose mail order EPO might be pennies. Do you inject it or swallow it? If the former, wonder where he got the pins and barrels.