I've done this kind of outreach before. Straight up names and phone numbers for pharmacists - you'll waste a lot of time calling cold. From a tracking perspective, you'll have zero conversion data to optimise against.
Better approach: scrape the General Pharmaceutical Council register (public data) for names and pharmacy addresses, then cross-reference with Companies House for direct contact details if they're a registered owner. You'll get maybe 60-70% hit rate that way.
But honestly? If you're showing them a platform, start with LinkedIn Sales Navigator targeting 'pharmacist' + 'owner' + 'independent'. connect first, drop your demo as a follow-up. Track the click-through rate. That gives you measurable leads, not just a phone number list you can't attribute spend to.
What's your platform do? Might be easier to narrow the list by pain point rather than blanket dialling.