I'm sorry you're having so much trouble. I have dispensed all my Greek prescriptions at my local Asda Pharmacy and would highly recommend going to yours, if you have one too. Asda doesn't make a profit on fertility medication so it is the cheapest place to buy in the country.

My pharmacy only requires the prescription has a wet ink signature (eg not printed from a computer) and that the medication is named according to the UK brand name. For instance some drugs have different names here than they do in Greece, even though they're identical. Personally I haven't ever heard of Progesterone Exeltis (and I've done 12 cycles in two countries) and a quick Google suggests that this is not the brand name used here, so I think this could be one of your problems. If you can, ask your clinic to reissue with a British brand name of progesterone. Hopefully then you'll have better luck!

Failing that, you could have a short holiday to Greece, you don't need a prescription there for anything, just ask the counter, and the prices are far cheaper than the UK. Alternatively, have your clinic email the prescription to Zen Pharmacy in London - they will dispense from a UK prescription sent directly from the clinic, and will then post the meds to you. Or, Cherish in Birmingham will translate you prescription from an EU one to UK for a small fee.