If vaginal Utro isn't an option, is there an independent pharmacy you could try for the Provera? I get mine (2.5mg though) from an independent & they have also been able to get hold of other meds for me the chains have been unable to supply. The pharmacist told me they are not tied in to contracts with suppliers & can ring around to get what's prescribed. Another thought is, if there's a shortage of the 5mg could the pharmacy get hold of either 2.5 or 10mg if your GP were to do a new script for you? You could double up on the 2.5mg or halve the 10mg (but check with the pharmacy the latter are scored or at least splittable - I haven't been able to find that detail looking very quickly on the web this evening - sorry short of time for more). Good luck with it Julia, I hope you manage to get what you need without too much more hassle, as I'm sure that's the last thing you need right now.
Wx