Oh if only it were so simple. It's far more complicated than the link provided portrays for reasons such as clawback fees imposed by the NHS, Special Order item fees, Import fees, Pharmacy Contractor fees based on the number of scripts that pass through the pharmacy annually, and container fees where appropriate to name but a handful.
I'd recommend that you look at the September 2022 edition of the Drug Tariff online if you have the time to spare. It will give you the fees the NHS gives pharmacies for individual drugs (the retail cost of if you like), but you'll only get the true reimbursement figure by wading through the other sections which give you the fees for the other stuff I mentioned. Good Luck!
GP Dispensers get different dispensing reimbursements and stuff like catheters are reimbursed at at different rate. I'll leave it there.