Hi Polpringle,
My understanding is the same as Dotty's - Utrogestan isn't licensed in the UK for vaginal use as part of HRT, but is prescribed by some doctors 'off book' to be used in this way. If it's used vaginally the dose is 100mg, taken as 1x100mg capsule; if it's taken orally the dose is 200mg, taken as 2x100mg capsules.
Utrogestan is licensed to be used vaginally for fertility treatment at a dose of 200mg, and is supplied with an applicator. Sounds very much like the GP has got the two mixed up.
Good luck with the other Dr.